mysql - ALTER TABLE error when adding new column - 


    alter table mytable add mycolumn int not null default(0)

when doing error: #1064 - have error in sql syntax; check manual corresponds mysql server version right syntax use near '(0)' @ line 2

any idea why? thanks!

the syntax default clause accept value not expression (even constant). see http://dev.mysql.com/doc/refman/5.0/en/data-type-defaults.html:

the default value clause in data type specification indicates default value column. 1 exception, default value must constant; cannot function or expression.

concretely, have remove parenthesis:

alter table mytable add mycolumn int not null default 0

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