CHOOSE (TSQL Function)

Returns the value corresponding to the specified index in the list of values.

Syntax

CHOOSE ( index , value_1 , value_2 [, ...value_n] )

Arguments

index
is an expression of type int, 1-based.
value_1 … value_n
is a list of expressions of any type.

Return Types

Returns the type which has the highest precedence from the list of value_1 to value_n.

Remarks

If index is larger than the number of values in the list, NULL is returned.

Examples

PRINT CHOOSE(3, 'Paris', 'Geneva', 'Moscow', 'Berlin');
PRINT CHOOSE(5, 'Paris', 'Geneva', 'Moscow', 'Berlin');

The result is:

Moscow
<NULL>

Example with different argument types:

PRINT CHOOSE(1, '10000', 'Geneva', 123, 'Berlin'); -- the string '2000' can be converted to int
PRINT CHOOSE(1, 'Paris', 'Geneva', 123, 'Berlin'); -- the string 'Paris' cannot be converted to int

The result type is int, because it has higher precedence than varchar:

10000
<Conversion error. VARCHAR "Paris" cannot be cast into INT, invalid string.>