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How do I concatenate in ALTER TABLE?
I tried this, but it didn’t work:
$sql1="ALTER TABLE t1 ADD iod = CONCAT('10.1234','/',id)";
id is a different column in the same table.
You’re misusing
ALTER TABLE. It is intended to modify the data definition (structure) of a table, not its values.If you want to modify the values in a table, you should use one of the following types of queries: