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setting a collumn to be unique in existing table
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setting a collumn to be unique in existing table mcyi2mr3@googlemail.com 10-22-2006
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Posted by mcyi2mr3@googlemail.com on October 22, 2006, 12:01 pm
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 hi all

ive been looking on the mysql site but i cant find the syntax to set a
collumn in an existing table to be unique.

could someone please give an example of how to do this.

i believe it goes something like: alter table tblname add unique
colname

but i could be wrong


Posted by mcyi2mr3@googlemail.com on October 22, 2006, 12:02 pm
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 also the syntax to unset this would also be useful. thanks


Posted by strawberry on October 22, 2006, 12:45 pm
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mcyi2mr3@googlemail.com wrote:
> also the syntax to unset this would also be useful. thanks

ALTER TABLE `my_table` ADD UNIQUE (`my_field`)

ALTER TABLE `my_table` DROP INDEX `my_field_index`

have a look at phpmyadmin


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