5.14. CHARACTER SET

5.14.1. ALTER CHARACTER SET

Used for

Setting the default collation for a character set

Available in

DSQL

Syntax

  1. ALTER CHARACTER SET charset
  2.   SET DEFAULT COLLATION collation
Table 59. ALTER CHARACTER SET Statement Parameters
ParameterDescription

charset

Character set identifier

collation

The name of the collation

The statement ALTER CHARACTER SET statement changes the default collation for the specified character set. It will affect the future usage of the character set, except for cases where the COLLATE clause is explicitly overridden. In that case, the collation sequence of existing domains, columns and PSQL variables will remain intact after the change to the default collation of the underlying character set.

If you change the default collation for the database character set (the one defined when the database was created), it will change the default collation for the database.

If you change the default collation for the character set that was specified during the connection, string constants will be interpreted according to the new collation value, except in those cases where the character set and/or the collation have been overridden.

Example of use

Setting the default UNICODE_CI_AI collation for the UTF8 encoding.

  1. ALTER CHARACTER SET UTF8
  2.   SET DEFAULT COLLATION UNICODE_CI_AI;