8.2.3 ATAN
Returns the angle (in radians) that is the inverse tangent of the target data, in the range -/2 to /2.
- Organization of this subsection
(1) Specification format
scalar-function-ATAN ::= ATAN(target-data) target-data ::= value-expression
(2) Explanation of specification format
- target-data:
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Specifies the numeric data whose inverse tangent is to be determined.
The following rules apply:
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Specify the target data in the form of a value expression. For details about value expressions, see 7.20 Value expression.
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Specify numeric data for the target data. For details about numeric data, see (1) Numeric data in 6.2.1 List of data types.
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You cannot specify a dynamic parameter by itself for the target data.
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(3) Rules
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The data type of the execution result is the DOUBLE PRECISION type.
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The NOT NULL constraint does not apply to the value of the execution result (the null value is allowed).
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If the target data has the null value, the execution result will be a null value.
(4) Example
- Example:
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Determine the inverse tangent of the values in columns C1 to C3 in table T1.
SELECT ATAN("C1"),ATAN("C2"),ATAN("C3") FROM "T1"