pass TEXT NOT NULL

);

INSERT INTO users VALUES ( 'larry',md5(random()::text) );

INSERT INTO users VALUES ( 'Tom',md5(random()::text) );

INSERT INTO users VALUES ( 'Damian',md5(random()::text) );

INSERT INTO users VALUES ( 'NEAL',md5(random()::text) );

INSERT INTO users VALUES ( 'Bjørn',md5(random()::text) );

INSERT INTO users VALUES ( 'larry',sha256(random()::text::bytea) );

INSERT INTO users VALUES ( 'Tom',sha256(random()::text::bytea) );

INSERT INTO users VALUES ( 'Damian',sha256(random()::text::bytea) );

INSERT INTO users VALUES ( 'NEAL',sha256(random()::text::bytea) );

INSERT INTO users VALUES ( 'Bjørn',sha256(random()::text::bytea) );

SELECT * FROM users WHERE nick = 'Larry';

</programlisting>

<para>

For example, consider:

<synopsis>

UPDATE t1 SET x = 2, y =md5sum(y) WHERE z = 100;

UPDATE t1 SET x = 2, y =func1(y) WHERE z = 100;

</synopsis>

Here, <literal>db_column:update</literal> will be checked for