|
-- Make a hard limit of 512 for the post.url column
|
|
-- Truncate existing long rows.
|
|
UPDATE
|
|
post
|
|
SET
|
|
url =
|
|
LEFT (url,
|
|
512)
|
|
WHERE
|
|
length(url) > 512;
|
|
|
|
-- Enforce the limit
|
|
ALTER TABLE post
|
|
ALTER COLUMN url TYPE varchar(512);
|
|
|
|
-- Add the index
|
|
CREATE INDEX idx_post_url ON post (url);
|
|
|