Matt L. wrote:
I need to test whether or not a value is null on
insert.
Example: insert into table (column) values
nullif('',''));
ERROR: column "column" is of type boolean but
expression is of type text.
Your problem is that NULL's are typed in PostgreSQL.
Try this:
SELECT NULL;
SELECT NULL::BOOL;
SELECT NULL::BOOL::TEXT;
to see what I mean. This is an exact illustration of your problem.
It works in MSSQL (probably against not standards) but
nonetheless I need to make it work.
I assume it's returning 'NULL' w/ quotes?
Nope. It is returning a text string which is valued at NULL. It cannot
convert a text string to a BOOL (even if the string is a NULL) so it
gives you an error.
I don't know
where to look to alter it. I looked into functions but
all I see is how to write "AS queries" or point to
various snippets. I'd rather just alter the nullif
function.
SELECT NULLIF('' = '', TRUE);
Does this work? You could write a wrapper function if necessary.....
Best Wishes,
Chris Travers
Metatron Technology Consulting
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