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SAP Sybase SQL Anywhere 16.0 » SQL Anywhere Server - SQL Reference » SQL data types

 

Data type conversions

Type conversions can happen automatically, or they can be explicitly requested using the CAST or CONVERT function. The following functions can also be used to force type conversions:

  • DATE function   Converts the expression into a DATE, and removes any hours, minutes or seconds. Conversion errors can be reported.

  • DATETIME function   Converts the expression into a TIMESTAMP, and removes any time zone. Conversion errors can be reported.

  • STRING function   This function is equivalent to CAST(value AS LONG VARCHAR).

  • VALUE+0.0   Equivalent to CAST( value AS DECIMAL ).

The following list is a high-level view of automatic data type conversions:

  • If a string is used in a numeric expression or as an argument to a function that expects a numeric argument, the string is converted to a number.

  • If a number is used in a string expression or as a string function argument, it is converted to a string before being used.

  • All date constants are specified as strings. The string is automatically converted to a date before use.

There are certain cases where the automatic database conversions are not appropriate. For example, the automatic data type conversion fails in the example below.

'12/31/90' + 5
'a' > 0
 See also

NCHAR to CHAR conversions
NULL constant conversions to NUMERIC and string types
Bit array conversions
Numeric set conversions
Java and SQL data type conversions