BigQuery cannot use analytic function in SELECT * REPLACE. Up now: Calculating page-specific metrics. BigQuery’s WITH statement, also known as Common Table Expressions (CTEs), can make your queries more readable and maintainable. INFORMATION_SCHEMA. js library via BigQuery UDF with external libraries. About Us. If X = +/-inf and Y = +/-inf, returns NaN. Aggregate functions. Below example is for BigQuery Standard SQL. Follow edited Nov 28, 2019 at 16:59. time_sec ) FROM bigquery-public-data. The value 1 refers to the first character (or byte), 2 refers to the second, and so. As I described in an earlier blog post, you can use clustering to understand your data in order to make data-driven decisions. When you export GA4 data to BigQuery, you own that data, and you can analyze users and their traffic on your property. 4' cases and by using round () it makes the value 0 and gives me a 'division by. In your query, you use the EXTERNAL_QUERY function to send a query statement to the external database, using. I assume that this happens due to the /sum(iff(iscode=1,1,0)) where this presumably sometimes returns 0. I hope BigQuery Standard SQL documentation will be as good as your recent related answers! I really like those examples! Thank you Elliott!! – Mikhail Berlyant. Than you run something like below - depends on how many tables you want to split to - as many times as needed. Works with both Google BigQuery and Snowflake data warehouse targets; Combines and integrates data from multiple sources, deduplicates and creates single contact and company records; Creates subject-area dimensional warehouses e. A user-defined function (UDF) lets you create a function by using a SQL expression or JavaScript code. There is no need to cover it in detail here, I’ll just mention a few of its features. 4. Here are some common functions and operations that use the SAFE_ prefix: SAFE_ADD (x, y): Safely adds two numeric values, handling nulls gracefully. I don't understand how to use the Regexp_extract() example mentioned in Split string into multiple columns with bigquery. To harness its full potential and ensure an… Open in appBigQuery is a cloud based data warehousing tool that lets you store and analyze petabytes of data at lightning speed. English. 5 Harness the Power of WITH Statements. In particular, if data is added to the source table, data previously in one side of the split should remain in the. The digital agency we worked with wanted to A) see their clients’ GA4 data all in one place and B) allow each of their clients to see their GA4 data alongside data from other data sources (e. In your query you created join with t2 table but t3 and t4 table names are not given in join. 👨💼 Account SAFE_ADD function in Bigquery - SQL Syntax and Examples. test_te. prefix. 建立 View：習慣上 view 的命名會前綴 vw_ 或是後綴 _vw、_view. GCP BIGQUERY YTD CUMILATIVE SUM BASED on MONTH. The Welcome to BigQuery in the Cloud Console message box opens. cast(t3. BigQuery: Divided by sum of values in column to find the ratio. This capability selectively masks column level data at query time based on the defined masking rules, user roles and privileges. Also, the source database might not be optimized for complex analytical queries. 1. Total AS PerCapita FROM medicare. Google BigQuery, a powerful serverless data warehouse, has become a cornerstone of data analysis and machine learning pipelines for many organizations. Google BigQuery SQL Tutorial 2023: Everything You Need to Know in One Article. 2 Answers. 0. Converts a STRING value to a TIME value. 黒魔術として名高い「ビッグデータ分析・活用のためのSQLレシピ」。. It's likely the bulk of your query time. After some experimenting, it seems this is due to a combination of USD_amt being an integer and division with NULL values. 03 per GB of data copied. Because of the low cost of BigQuery storage, you don't need to optimize your tables for cost as you would in a relational database system. If you add a engaged session filter to your where statement it should fix your issue. Open the BigQuery page in the Google Cloud console. g. User-defined functions. viewsPerUser and eventCount pageTopSummary AS ( SELECT page, ROUND (SAFE_DIVIDE(SUM(engagementTimeMsec),COUNT(DISTINCT user_pseudo_id)),2). . How to avoid division by 0 in ms-sql select statement? 1. An operator manipulates any number of data inputs, also called operands, and returns a result. 1. Aggregate functions. using STRUCT in bigquery. 0. reason I included it initially is - I thought. In essence, they are evaluated left to right, with short-circuiting, and only evaluate the output value that was chosen. end_ms - unnest_job_stages. After you have the annualized number, you divide by the average inventory for the period. SAFE_DIVIDE(x, y): Safely divides two numeric values, handling nulls and division by zero gracefully. Mikhail Berlyant Mikhail Berlyant. medium AS medium,. Merged. GROUPING. You can adjust the @Return to a different data. Asking for help, clarification, or responding to other answers. SUM(Val1 / (1 - (Val2 + Val3))) AS Calc1 Share. BigQuery to aggregate with array. In this dataset I'd like to get data like sessions, bouncerates, new users but most importantly, conversion rates. Follow edited May 2, 2019 at 13:11. The cost is $0. I previously was using a CASE WHEN function but wanted to change it to an IF as there is only one case. Storage management Internally, BigQuery stores data in a proprietary columnar format called CapacitorUnderstand slots. name) AS name, ANY_VALUE (sale_item. You seem to have data with one row per state, so you only need a JOIN. BigQuery NULLIF () allows you to treat certain values as NULL. The Verdict. The CAST and EXTRACT functions also do not support the SAFE. Most data types can be cast from one type to another with the CAST function. When plotting the interpolated population we now get the intuitive result that population is concentrated in the city center and density decreases further away from the center. Currently we have limited slots in our GCP project. Part of Google Cloud Collective. ml_datasets. start_ms)) AS jobstage_max_slots, -- Check if there's a job that. OVER (PARTITION BY stock1, stock2 ORDER BY date ASC)) as logspreadreturn, SAFE_DIVIDE((spreadclose - sma20), stdev20) as zscore20 FROM `rw-algotrader-264713. For example, if you're running on Postgres and wish to override the behavior of dbt_utils. filter gets tranlated to WHERE clauses). Here's the simple function that I wrote. prefix. In order to accurately detect and classify bot traffic in GA4 using BigQuery ML, we first need to identify patterns in the data that indicate bot activity. Constructs a DATE value. In this query, the CASE statement returns null when the value in column2 is 0, effectively handling division by zero without returning. First, let’s take a look at the original dataset. SAP HANA can now combine data from Google BigQuery, enabling data federation and/or data ingestion into the HANA platform. 24. NULLIF takes two arguments: the expression of interest, and the value you want to override. You can use this (over-expressive) way: select IF (noOfGirls=0, NULL, round (noOfBoys/noOfGirls)) as ration from student; Which will put out NULL if there are no girls, which is effectively what 0/0 should be in SQL semantics. You partition tables by specifying a partition column which is used to segment. Google Bigquery: How do I divide 2 values in the same column? 3. Mar 30, 2020 at 14:56. You can then create/manage buckets of slots called reservations and assign projects, folders, or. The current exception to this is the ARRAY data type because arrays of arrays are not supported. Bigquery - Grouping by an array and summing. In BigQuery, the SAFE_ prefix is used as a way to perform safe operations on potentially null or problematic data, preventing errors that might occur with traditional SQL operations. Featured on Meta Update: New Colors Launched. With the help of unnest and parse for dates or timestamps we can do the trick. For BYTES, you must specify a delimiter. I would like to have a reusable insert function for BigQuery that leverages the PEP 249 dbapi implementation provided by the BQ library (google. You can convert Amazon Redshift data types that BigQuery doesn't implicitly convert using BigQuery's CAST(expression AS type) function or any of the DATE and TIMESTAMP conversion functions. I will update answer. SAFE_ADD; SAFE_CONVERT_BYTES_TO_STRING; SAFE_DIVIDE; SAFE_MULTIPLY; SAFE_NEGATE; SAFE_OFFSET and SAFE_ORDINAL; SAFE_SUBTRACT; When a row fails during computation of a function, Bigquery will throw a NULL Value instead of. Syntax: CONVERT( data_type [ ( length ) ], expression [, style ] ) The optional "style" argument specifies how the value is going to be converted; this implementation ignores the style parameter. 2 Answers. Aggregate functions. BigQuery Reservations help manage your BigQuery workloads. Also, you're using FLOAT64 which is specific to Bigquery too, you should be using just float. The best way to avoid dividing by zero in SQL is to use the NULLIF function. zipcode ) To set up your join, you first give each table you’re joining an alias (a and b in our case), to make referencing their columns easier. id t2. This topic lists information about what functions you can use in Spotfire, for example for writing custom expressions and adding calculated columns, when you work with in-database data tables from Google BigQuery. This topic lists information about what functions you can use in Spotfire, for example for writing custom expressions and adding calculated columns, when you work with in-database data tables from Google BigQuery. Create BigQuery-table via Python BQ API: 4. If the subquery returns zero rows, the result is NULL . using BigQuery, I would like to be able to divide one column, column1, into two separate columns, column2, and column3 with 50% of all records in column1 in column2 and 50% of all records in column1 in column 3. status =. If X = +/-inf and Y = +/-inf, returns NaN. Tried to fix using the below query but getting the same result as above. Console SQL bq API Go Java Node. safe_divide처럼 0으로 나눌때 nan을 반환해서 편리할 수 있지만, 0이 아닌 수를 0으로 나눌때 inf를 반환하기에 개인적으로는 평상시에는 잘 사용하지 않는다. SAFE_DIVIDE: Equivalent to the division operator (X / Y), but returns NULL if. sql("SELECT id, name, CAST(value AS. К примеру SAFE_DIVIDE(X,Y)=x/y и если y=0, то оператор вернет null. SELECT actiontimestamp, medium, source, sessions, ROUND(SAFE_DIVIDE(pageviews, sessions), 0) AS pages_per_session, CASE WHEN sessions = 0 THEN 0 ELSE. unnest (event_params) where key = 'session_engaged') = '1'. num, 0). If Y=0 and X=0, returns NaN. Below are the list of SAFE Functions available in Bigquery. Fundamentally, BigQuery is using the S2 index to map a geometry into a 64-bit integer, then BigQuery clusters on that integer using existing integer-based clustering mechanisms. This example query contains all following Google Analytics event tracking dimensions and metrics. Work with arrays. FollowThe query is as follows: SELECT *, ROUND (SAFE_DIVIDE (budget, DATETIME_DIFF (CURRENT_DATE (), LAST_DAY (CURRENT_DATE ()), DAY)),2) AS daily_budget FROM `mm-demo-project. Here is the full query with example data. The Challenge. You can make your function more robust using SAFE functions inside a UDF and also make it return default value if it fails like below. SAFE_DIVIDE( u. population p JOIN medicare. Step-by-step instructions for how to create shapefiles from BigQuery results. . Cost / p. SELECT cast(ST_GEOGFROMTEXT('POINT(51. It divides value using the delimiter argument. With BigQuery, there's no infrastructure to set up or manage, letting you focus on finding meaningful insights using GoogleSQL and taking advantage. Please use the safe_divide command, if there is any chance of diving by zero. function or the. Follow asked Feb 3 at 8:57. Improve this answer. There is no current way to split () a value in BigQuery to generate multiple rows from a string, but you could use a regular expression to look for the commas and find the first value. g. SAFE_ADD; SAFE_CONVERT_BYTES_TO_STRING; SAFE_DIVIDE; SAFE_MULTIPLY; SAFE_NEGATE; SAFE_OFFSET and SAFE_ORDINAL; SAFE_SUBTRACT; When a row fails during computation of a function, Bigquery will throw a NULL Value instead of aborting the entire query. Scheduled queries must be written in GoogleSQL, which can include data definition language (DDL) and data manipulation language (DML) statements. BigQueryはビッグデータを扱える高速安価なデータウェアハウスとして知られているが、. Also, you're using FLOAT64 which is specific to Bigquery too, you should be using just float. You have a choice of using an on-demand pricing model or a capacity-based pricing model. GoogleSQL for BigQuery supports string functions. bookmark_border. Related. Data alerts are a perfect. reason I included it initially is - I thought it might give you an idea of introducing some default value for rows where it is division by 0. Last time I showed how to use a PostgreSQL instance with PostGIS to fix invalid geometries, now I’m glad to introduce new BigQuery native options that simplify loading geospatial data, including invalid geometries. In Spark SQL, cast function will return null if the conversion is not possible. AS eventAction, trafficSource. Overview of the BigQuery page. (i. Since its inception, numerous features and improvements have been made to. 良く使う関数はデータや分析の特性によって異なるので、あくまでも独断と偏見に基づく関数セレクションです. Approximate. -- Compare an array of codepoints for two strings. This isn't an elegent solution by any means, but would probably work: SELECT Estimate_A, Estimate_B, Estimate_C, --Add values of each column, divide by number of non-null columns ( IFNULL (Estimate_A,0) + IFNULL (Estimate_B,0) + IFNULL (Estimate_C,0) ) / ( IF (Estimate_A IS NULL, 0,1) + IF (Estimate_B IS NULL, 0,1) + IF. CASE WHEN COUNT(DISTINCT item_id) = 0 THEN NULL ELSE COUNT(DISTINCT item_id) END If you are writing your script in bigquery then, you could simply use. This can be useful if you need to group your data to build partitions, histograms, business-defined rules, and more. A UDF accepts columns of input, performs actions on the input, and returns the result of those actions as a value. To translate ad hoc queries, use interactive SQL translation. `<dataset-region>`. BigQuery Reservation API. * what is being run against your datasets and to know this code is safe. To prevent this and avoid getting the “division by zero” error, we can use the SAFE_DIVIDE function or the NULLIF function. 0 else 0 end) as null_ratio FROM table GROUP BY country_code; If you want to do the count and divide by the total, then use COUNTIF (): SELECT country_code, COUNTIF (store_code IS NULL) * 1. TensorFlow’s BigQueryClient uses the Storage API to efficiently read data directly out of BigQuery storage (i. This query gives you the euclidean coordinates of the normal distribution centred in 0. I have a quick question on Round () Syntax. “Safe” functions like this one are often useful for calculated fields that are generated by performing operations on columns that may contain NULL or 0 values. Approximate. You can construct arrays of simple data types, such as INT64, and complex data types, such as STRUCT s. If you are sharding tables by date, use time-partitioned tables instead. Step 1: Understanding the basics of data partitioning in BigQuery. google-bigquery; Share. It is required to calculate for all platforms (iOS / Android / Web). Note that using SAFE_OFFSET() can be important as sometimes BigQuery will execute SQL even if it doesn’t need to. With flat-rate pricing, you can purchase BigQuery slot commitments in 100-slot increments in either flex, monthly, or yearly plans instead of paying for queries on demand. table` AS ( SELECT 1 id, '1/2' list UNION ALL SELECT 2, '1/3' UNION ALL SELECT 3, '10/20' UNION ALL SELECT 4, '15/' UNION ALL SELECT 5, '12/31' ) SELECT id, SPLIT (list, '/') [SAFE_OFFSET (0)] AS first_element, SPLIT (list, '/'). Queries that use functions and operators that are not on this list might run more slowly. 10. It has a community of 320 open source contributors collaborating on the project. BigQuery presents data in tables, rows, and columns and provides full support for database transaction semantics ( ACID ). Aggregate functions. Aggregate functions. temp. ”. With flat-rate pricing, you can purchase BigQuery slot commitments in 100-slot increments in. In the Explorer panel, expand your project and select a dataset. In part two of the Google Analytics + Bigquery Tips series, we covered nesting in the Google Analytics (GA) BigQuery (BQ) export. Alternative Method: Another way to handle division by zero in Standard SQL is to use the CASE statement, like this: SELECT column1 / CASE WHEN column2 = 0 THEN NULL ELSE column2 END AS result FROM your_table. Use the CREATE TABLE statement and declare a column with the JSON type. CREATE OR REPLACE TABLE `fh-bigquery. Below is for BigQuery Standard SQL and (I think) covers most of crazy variation of date representations by using moment. IFNULL函数返回第一个参数，如果第一个参数为NULL，则返回第二个参数。. I've created a reproducible example of my efforts thus far: WITH wide_stats AS ( ( SELECT 'joe' name, 'bills' team, struct (struct (7 as fga, 5 as fgm) as o, struct (8 as fga, 3 as fgm) as d) as t1,. SAFE_ADD: Equivalent to the addition operator (X + Y), but returns NULL if overflow occurs. 1 Answer. 3 minutes while uploading directly to Google Cloud Storage takes less than a minute. tables = get_size. 18. After you have the annualized number, you divide by the average inventory for the period. 8 for example, and that will represent 80% of our data. This document details the similarities and differences in SQL syntax between Apache Hive and BigQuery to help you plan your migration. Result types for Addition, Subtraction and. Simply divide a bigger table into various smaller ones that have more. I don't know much about the contents of event_v1 requests or ip_addresses which could divide it, but I'm willing to bet there's a lot more rows there than there are in the geo_ip_countries. 2 UNION ALL SELECT 'Female', NULL, 84 UNION ALL SELECT 'Male', IEEE_Divide(-3,0), 0) SELECT * FROM new_data WHERE Height < 100. See the full package health analysis to learn more about the package maintenance status. I am trying to get a benchmark dataset in BigQuery. Gets the count of TRUE values for an expression. This will return for each row a pseudo-random decimal number, in the interval [0–1), inclusive of 0 and exclusive of 1. SELECT field1, field2, RAND () AS rnd FROM YourBigTable. One point of clarification for this answer, I'd recommend pointing out that the OP is looking to round down to the nearest 0. The Google BigQuery Numeric Data Type can be broken down into four sub-categories: Integer (INT 64) Numeric (NUMERIC DECIMAL) BigNumeric; Float. chicago_taxi_trips. I don’t visit greatest and very helpful app like This app in. 3', '0. Operators such as + and = do not support the SAFE. AVG, COUNT, COUNTIF, LOGICAL_AND, LOGICAL_OR, MAX, MIN, STRING_AGG, SUM. 4 by multiplying by 100. The table storage views give you a convenient way to observe your current. Click add_box Compose a new query. 234 becomes 1823. t = The sum of bytes for all columns in the table being updated by the DML statement, as they are at the time the query starts. zipcode_area` a LEFT JOIN `bigquery-public-data. Think of most frequently used marketing channel, device, visit frequency & recency and most viewed. To prevent errors from a division operation, use SAFE_DIVIDE. 12471081312336843)') as. If we want to split the string into columns, we have to use the OFFSET (for zero-based indexes) or ORDINAL (for one-based indexes) operator. 💡. BigQuery is Google Cloud's fully managed, petabyte-scale, and cost-effective analytics data warehouse that lets you run analytics over vast amounts of data in near real time. In contrast, BigQuery uses a columnar. You can schedule queries to run on a recurring basis. To randomly split a data set, we can use the RAND () function. It would be perfectly legal for Oracle to evaluate the. The first step in this project, as with most data science tasks, was to gather the data first. Partitioning tables in BigQuery is another way of how to optimize your data storage. [View Name] # 或是 CREATE VIEW IF NOT EXISTS 視需求而定. Bigquery safe_divideQuery syntax. 2018_07, and add it to the output you have so far, this should simplify the query you first used. Operators are represented by special characters or keywords; they do not use function call syntax. Extracts part of a TIME value. Learn more and grab the SQL cheat sh. I've got a table where a string column is called "status" and there are different kinds of entries - opened, clicked, sent, etc. To start using BigQuery, you create a project to host your data, and then you enable billing. answered Nov 28. This article is about GA3 - Universal Analytics. It returns null if the denominator is zero or either value is null. Aggregate functions. Aggregate functions. If there are more than 16,000 rows BigQuery won't be able to export it. Approximate. Note: you need to upload moment. DataFrame. State, cbs. One way to do it is to do it is through a self-join with the same table and a 1-month delay. Some operators, such as IN , ARRAY , and UNNEST , resemble functions but don't support the SAFE. In BigQuery, I'm using the default Google Analytics 4 data import tables. Netezza SQL is based on Postgres 7. state = cbs. This topic lists information about what functions you can use in Spotfire, for example for writing custom expressions and adding calculated columns, when you work with in-database data tables from Google BigQuery. SELECT col1 ,col2 ,col3 FROM tbl1 as t1 JOIN t2 ON t1. g. Step 3: Further, expand the Saved queries. SELECT h3, ANY_VALUE(h3geo) as hex_geo, SUM(SAFE_DIVIDE(intersection_h3,cbg_area) * total_pop) as h3_pop FROM geom_overlap GROUP BY h3. 1. 継続率をQueryで集計するメリット. I have the following table that contains nested STRUCT s, and in a subquery, I am trying to add additional columns at the struct level. 1. null のときに任意に書き換えができます。 最終アウトプットはグラフをイメージしているので今回は0に書き換えます。 カテゴリ別の売上を人数で割るとこんな感じですかね。To fix the divide-by-zero error, you can do a safe divide. In this second part of the BigQuery data alert article series (), we considered making the alert message more informative using temp tables, functions, and dynamic SQL. divide-by-zero; or ask your own question. BigQuery ユーザーであれば、あなたはすでにスーパーヒーローです。. If you want to protect your queries from these types of errors, you can use SAFE_CAST. SUM(SAFE_DIVIDE(Val1, 1 - (Val2 + Val3))) AS Calc1 instead of . BigQuery Window Functions, also known as Analytic Functions, is a set of functions that helps you compute values over a group of rows and return a single result for each row. Unary negation!, NOT: NOT: Types supporting equality comparisons: All primitive types: All comparable types and. Go to BigQuery. DATE_FROM_UNIX_DATE. Explicit conversion types. This topic lists information about what functions you can use in Spotfire, for example for writing custom expressions and adding calculated columns, when you work with in-database data tables from Google BigQuery. state = cbs. It would be great to add a bigquery style 'safe_divide' function. For instructions, see the BigQuery Quickstart (/bigquery/quickstart-web-ui#before-you-begin). dataset. 0 / total. table_id,table. __TABLES' but that is not allowed within BigQuery. AVG, COUNT, COUNTIF, LOGICAL_AND, LOGICAL_OR, MAX, MIN, STRING_AGG, SUM. In BigQuery, SAFE_CAST is used to prevent errors from casting. You can use this function to handle a potential division by zero by wrapping the denominator in a call to NULLIF. This message box provides a link to the quickstart guide and lists UI updates. Let’s assume we have a table named users with columns User_ID and Name. You can think of it as “if NULL, then. Click on the query you want to explore to see the results. In the Google Cloud console, go to the BigQuery page. TABLE_STORAGE view, the query results contain one row for each table or materialized view for the current project. Basically the prefix SAFE_ can be added to other BigQuery functions to handle errors. Precision is the number of digits that the number contains. 5. Como mencionado anteriormente, o BigQuery Editions faz o escalonamento automático de slots ⁷, ou seja, quando a plataforma está ociosa ou com pouca carga, apenas os slots necessários são. BigQuery - No mathcing signature for operator CASE in conjunction with CAST to INT64. min),(mm. The diagram below shows the ways that the BigQuery web console and Jupyter Notebook and BigQuery Python client interact with the BigQuery jobs engine. Another method to handle division by zero is the NULLIF. You can only ROUND () a single number: So you would first do the SAFE_DIVIDE () and then do the ROUND (). Using BigQuery to do a subquery on a date array. Total AS PerCapita FROM medicare. Aggregate functions. Therefore, the query would not show the desired effect after 30th of August 2022. SAFE_NEGATE (x. In BigQuery, I'd like to replicate the Google Analytics 4 statistic 'engagement rate', which is defined as ( more info ): sessions with engagement / total sessions. WITH a AS ( SELECT date AS Date, SUM (Val1 / NULLIF ( (1 - (Val2 + Val3)),0)) AS Calc1, FROM `project. SAFE_DIVIDE (x, y): Safely divides two numeric values, handling nulls and division by zero gracefully. The "CONVERT(type, expr [,style])" function (Microsoft SQL Server). Aggregate functions. This contributes to the execution of complex tasks in a timely manner. I have a table which stores sales targets - these are typically set by month, but entered by day - which means the daily target is the month target divided by the number of days. Here is the full query with example data. It is required to calculate for all platforms (iOS / Android / Web). These data type conversions are explicit, but some conversions can happen implicitly. Share. Figure out math questions. The basic version of the query is very simple: SELECT name, date, ARRAY_AGG ( STRUCT<category STRING, value STRING, number INT64> (category,value,number) ) AS items FROM data GROUP BY 1,2. A series of pre-designed libraries for Google APIs. Within the tfe_codelab dataset you just created,. AVG, COUNT, COUNTIF, LOGICAL_AND, LOGICAL_OR, MAX, MIN, STRING_AGG, SUM. You can organize query results by date and time by. Use . 0. Also :. The sample code is as follow:Cosine distance (as well as Euclidean and Manhattan distances) are now native functions in BigQuery. Check out this actionable Google BigQuery SQL tutorial to learn how your query (e. Gets the logical AND of all non- NULL expressions. The behavior of IEEE_DIVIDE is further illustrated in the table below. これ以上おすすめする本はないと言えるくらい有用な本でした。. This topic lists information about what functions you can use in Spotfire, for example for writing custom expressions and adding calculated columns, when you work with in-database data tables from Google BigQuery. BigQuery needs to wait for the source database to execute the external query and temporarily move data from the external data source to BigQuery.