SQL COLLATE: Usage Guide

1 year ago
Liam
1 minute

In SQL, the COLLATE keyword is used to specify the rules for sorting and comparing character data. It can be used in SELECT, UPDATE, INSERT, and DELETE statements.

The general usage method is as follows:

  1. In a SELECT statement, the COLLATE keyword can be used to specify the sorting order for a specific column, for example:
SELECT column1 
FROM table1 
ORDER BY column1 COLLATE Latin1_General_CI_AS
  1. In the UPDATE statement, you can use the COLLATE keyword to specify a sorting rule for specific columns, for example:
UPDATE table1 
SET column1 = 'new_value' 
WHERE column2 = 'value' COLLATE Latin1_General_CI_AS
  1. In a CREATE TABLE statement, you can specify a sorting order for columns, for example:
CREATE TABLE table1 (
    column1 VARCHAR(50) COLLATE Latin1_General_CI_AS
)
  1. In the WHERE clause, you can use the COLLATE keyword to specify the comparison rules, for example:
SELECT column1 
FROM table1 
WHERE column1 = 'value' COLLATE Latin1_General_CI_AS

By using the COLLATE keyword, you can customize the sorting and comparison rules for character data as needed to better meet specific requirements.

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