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slug | sidebar_position | sidebar_label |
---|---|---|
/en/sql-reference/functions/comparison-functions | 35 | Comparison |
Comparison Functions
Below comparison functions return 0 or 1 as Uint8.
The following types can be compared:
- numbers
- strings and fixed strings
- dates
- dates with times
Only values within the same group can be compared (e.g. UInt16 and UInt64) but not across groups (e.g. UInt16 and DateTime).
Strings are compared byte-by-byte. Note that this may lead to unexpected results if one of the strings contains UTF-8 encoded multi-byte characters.
A string S1 which has another string S2 as prefix is considered longer than S2.
equals, =
, ==
operators
Syntax
equals(a, b)
Alias:
a = b
(operator)a == b
(operator)
notEquals, !=
, <>
operators
Syntax
notEquals(a, b)
Alias:
a != b
(operator)a <> b
(operator)
less, <
operator
Syntax
less(a, b)
Alias:
a < b
(operator)
greater, >
operator
Syntax
greater(a, b)
Alias:
a > b
(operator)
lessOrEquals, <=
operator
Syntax
lessOrEquals(a, b)
Alias:
a <= b
(operator)
greaterOrEquals, >=
operator
Syntax
greaterOrEquals(a, b)
Alias:
a >= b
(operator)