Question

i have this table called test with one field called times.

and i insert a time into is in a UNIX time stamp format: 1318055933

then i want do an update where the (current time – times) > 600

UPDATE test SET times= 0 WHERE (UNIX_TIMESTAMP() - times> 600);

this query doesn’t seem to work,

any ideas what i am doing wrong?

thanks

Answer 1

Try casting the UNIX_TIMESTAMP() function to a signed integer.

UPDATE test SET times= 0 WHERE (CAST(UNIX_TIMESTAMP() AS SIGNED) - times> 600);

I found this in the MySQL manual. Depending on the data type of the times column, you might have to cast that as well.

If you want to subtract UNIX_TIMESTAMP() columns, you might want to cast the result to signed integers. See Section 11.10, “Cast Functions and Operators”.