ClickHouse/docs/en/sql-reference/functions/comparison-functions.md
2023-05-23 15:59:08 -03:00

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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 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)