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add constraint to existing column sql
add constraint to existing column in mysql
add not null constraint to existing column
sql add unique constraint to existing column
add default constraint sql to existing column
sql add check constraint to existing column
add default constraint to existing column
add unique constraint to existing column
add constraint to existing column sql, add constraint to existing column in mysql, add not null constraint to existing column, sql add unique constraint to existing column, add default constraint sql to existing column, sql add check constraint to existing column, add default constraint to existing column, add unique constraint to existing column