ClickHouse/docs/en/sql-reference/functions/comparison-functions.md

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/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 accross 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

Syntax

equals(a, b)

Alias:

• a = b (operator)
• a == b (operator)

notEquals

Syntax

notEquals(a, b)

Alias:

• a != b (operator)
• a <> b (operator)

less

Syntax

less(a, b)

Alias:

• a < b (operator)

greater

Syntax

greater(a, b)

Alias:

• a > b (operator)

lessOrEquals

Syntax

lessOrEquals(a, b)

Alias:

• a <= b (operator)

greaterOrEquals, >= operator

Syntax

greaterOrEquals(a, b)

Alias:

• a >= b (operator)