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how to comment a column and how to remove a comment from a column

Create Comment

COMMENT ON < SCHEMA >.< TABLE > ( IS '< this is a comment >')


Update Comment

Use the same command to define a new comment at the same column


COMMENT ON < SCHEMA >.< TABLE > ( IS '< this is a comment >')


Remove Comment(Put two simple quotes without space)

COMMENT ON < SCHEMA >.< TABLE > ( IS '')

Security for databases
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