Firebird Documentation IndexFirebird 2.5 Language Ref. UpdateInternal functions → ATAN()
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ATAN()

Available in: DSQL, PSQL

Added in: 2.1

Description: Returns the arc tangent of the argument.

Result type: DOUBLE PRECISION

Syntax: 

ATAN (number)
  • The result is an angle in the range <-π/2, π/2>.

Important

If the external function ATAN is declared in your database, it will override the internal function. To make the internal function available, DROP or ALTER the external function (UDF).

Prev: ASIN()Firebird Documentation IndexUp: Internal functionsNext: ATAN2()
Firebird Documentation IndexFirebird 2.5 Language Ref. UpdateInternal functions → ATAN()