=
Operatore (eq sign)
Si applica a: Databricks SQL
Databricks Runtime
Restituisce true
se expr1
è uguale a expr2
o false
in caso contrario. Questa funzione è un sinonimo di operatore == (eq eq sign).
Sintassi
expr1 = expr2
Argomenti
-
expr1
: espressione di qualsiasi tipo paragonabile. -
expr2
: espressione che condivide un tipo meno comune conexpr1
.
Valori restituiti
Oggetto BOOLEAN
.
Esempi
> 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