Jaa

= (eq sign) operator

  • Artikkeli

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime

Returns true if expr1 equals expr2, or false otherwise. This function is a synonym for == (eq eq sign) operator.

Syntax

expr1 = expr2

Arguments

  • expr1: An expression of any comparable type.
  • expr2: An expression sharing a least common type with expr1.

Returns

A BOOLEAN.

Examples

> SELECT 2 = 2;
 true

> SELECT 1 = '1';
 true

> SELECT true = NULL;
 NULL

> SELECT equal_null(true, NULL);
 false

> SELECT NULL = NULL;
 NULL

> SELECT equal_null(NULL, NULL);
 true

-- By default string comparisons are trailing space sensitive
-- This can be overridden by using the COLLATE clause
> SELECT 'hello' = 'hello  ' AS default,
         'hello' = 'hello  ' COLLATE UTF8_BINARY AS utf8_binary,
         'hello' = 'hello  ' COLLATE UTF8_BINARY_RTRIM AS rtrim;
 default utf8_binary rtrim
 ------- ----------- -----
 false   false       true

 -- By default string comparisons are trailing space sensitive
-- This can be overridden by using the COLLATE clause
> SELECT 'world  ' = 'world     ' AS default,
         'world  ' = 'world     ' COLLATE UTF8_BINARY AS utf8_binary,
         'world  ' = 'world     ' COLLATE UTF8_BINARY_RTRIM AS rtrim;
 default utf8_binary rtrim
 ------- ----------- -----
 false   false       true