sql - Equivalent of string contains in google bigquery

Sql - Equivalent of string contains in google bigquery

In Google BigQuery, to check if a string contains a specific substring, you can use the STRPOS function or the LIKE operator. Here's how you can use each method:

Using STRPOS

The STRPOS function returns the position of the first occurrence of a substring in a string. If the substring is not found, it returns 0.

SELECT column_name, CASE WHEN STRPOS(column_name, 'substring') > 0 THEN 'contains' ELSE 'does not contain' END AS contains_substring FROM your_table;

Using LIKE

The LIKE operator is used in a WHERE clause to search for a specified pattern in a column.

SELECT column_name, CASE WHEN column_name LIKE '%substring%' THEN 'contains' ELSE 'does not contain' END AS contains_substring FROM your_table;

Example

Suppose you have a table my_table with a column text_column, and you want to find rows where text_column contains the substring "example".

Using STRPOS

SELECT text_column, CASE WHEN STRPOS(text_column, 'example') > 0 THEN 'contains' ELSE 'does not contain' END AS contains_example FROM my_table;

Using LIKE

SELECT text_column, CASE WHEN text_column LIKE '%example%' THEN 'contains' ELSE 'does not contain' END AS contains_example FROM my_table;

Filtering Rows Based on Substring Containment

If you want to filter rows where the column contains the substring "example":

Using STRPOS

SELECT text_column FROM my_table WHERE STRPOS(text_column, 'example') > 0;

Using LIKE

SELECT text_column FROM my_table WHERE text_column LIKE '%example%';

Performance Considerations

  • The LIKE operator can be slower, especially for large datasets, because it may need to scan each row and match the pattern.
  • The STRPOS function can be faster for simple substring searches as it directly returns the position of the substring.

Choose the method that best fits your specific use case and performance requirements. For simple substring containment checks, both methods are generally effective, but STRPOS might offer slight performance advantages.

Examples

  1. SQL query to mimic string contains in Google BigQuery using LIKE operator:

    • Description: This query selects records where a specific column contains a substring in Google BigQuery using the LIKE operator with the '%' wildcard.
    SELECT * FROM table_name WHERE column_name LIKE '%substring%';

  2. SQL query to replicate string contains in Google BigQuery using REGEXP_CONTAINS function:

    • Description: This query checks if a string column contains a substring in Google BigQuery using the REGEXP_CONTAINS function with a regular expression pattern.
    SELECT * FROM table_name WHERE REGEXP_CONTAINS(column_name, r'substring');

  3. SQL query to simulate string contains in Google BigQuery using POSITION function:

    • Description: This query determines if a string column contains a substring in Google BigQuery by checking if the position of the substring is greater than zero.
    SELECT * FROM table_name WHERE POSITION('substring' IN column_name) > 0;

  4. SQL query to imitate string contains in Google BigQuery using CONTAINS function:

    • Description: This query emulates string contains functionality in Google BigQuery by checking if a string column contains a specific substring using the CONTAINS function.
    SELECT * FROM table_name WHERE CONTAINS(column_name, 'substring');

  5. SQL query to mirror string contains in Google BigQuery using SPLIT function:

    • Description: This query mirrors string contains operation in Google BigQuery by splitting the string column into an array of substrings and checking for the presence of the target substring.
    SELECT * FROM table_name WHERE 'substring' IN UNNEST(SPLIT(column_name, ' '));

  6. SQL query to reproduce string contains in Google BigQuery using LIKE operator with CONCAT function:

    • Description: This query replicates string contains operation in Google BigQuery by concatenating the column values with '%' wildcards and using the LIKE operator.
    SELECT * FROM table_name WHERE column_name LIKE CONCAT('%', 'substring', '%');

  7. SQL query to echo string contains in Google BigQuery using POSITION function with LOWER function:

    • Description: This query echoes string contains functionality in Google BigQuery by converting both the column and substring to lowercase and then checking the position.
    SELECT * FROM table_name WHERE POSITION('substring' IN LOWER(column_name)) > 0;

  8. SQL query to mimic string contains in Google BigQuery using ARRAY functions:

    • Description: This query mimics string contains operation in Google BigQuery by converting the string column to an array of substrings and checking for the presence of the target substring.
    SELECT * FROM table_name WHERE ARRAY_CONTAINS(SPLIT(column_name, ' '), 'substring');

  9. SQL query to simulate string contains in Google BigQuery using CONCAT function with INSTR function:

    • Description: This query simulates string contains functionality in Google BigQuery by concatenating the column values with the target substring and then using the INSTR function to check for its presence.
    SELECT * FROM table_name WHERE INSTR(column_name, 'substring') > 0;

  10. SQL query to imitate string contains in Google BigQuery using LIKE operator with LOWER function:

    • Description: This query imitates string contains operation in Google BigQuery by converting both the column and substring to lowercase and then using the LIKE operator.
    SELECT * FROM table_name WHERE LOWER(column_name) LIKE LOWER('%substring%');

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