Documentation Home
MySQL 8.0 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 47.2Mb
PDF (A4) - 47.2Mb
PDF (RPM) - 42.7Mb
HTML Download (TGZ) - 10.9Mb
HTML Download (Zip) - 10.9Mb
HTML Download (RPM) - 9.4Mb
Man Pages (TGZ) - 229.9Kb
Man Pages (Zip) - 335.5Kb
Info (Gzip) - 4.2Mb
Info (Zip) - 4.2Mb
Excerpts from this Manual

1.8.2.2 UPDATE Differences

If you access a column from the table to be updated in an expression, UPDATE uses the current value of the column. The second assignment in the following statement sets col2 to the current (updated) col1 value, not the original col1 value. The result is that col1 and col2 have the same value. This behavior differs from standard SQL.

UPDATE t1 SET col1 = col1 + 1, col2 = col1;