, . - UNIQUE
tag
:
INSERT IGNORE INTO tags (tag) VALUE ('new_tag')
INSERT INTO tag2post (postid, tagid)
VALUES
(
332,
(SELECT tagid FROM tags WHERE tag = 'new_tag')
)
,
INSERT IGNORE
. , SELECT
, , INSERT
, , // SELECT
. INSERT
LAST_INSERT_ID()
int, , SELECT
..
, concurrency , . , UNIQUE
tag
, INSERT
s.