MySQL存储过程获取记录排名（一般用于投票系统）

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CREATE PROCEDURE `get_rank`(IN `school` INT)
BEGIN
SET @votes = (SELECT COUNT(tcl_vote.vote_id) AS counts FROM tcl_works LEFT JOIN tcl_vote ON tcl_vote.works_id = tcl_works.works_id WHERE tcl_works.school_id=school);
SET @gt = (
SELECT
COUNT(*)
FROM
(
SELECT
tcl_works.school_id,COUNT(tcl_vote.vote_id) AS votes
FROM
tcl_works
LEFT JOIN tcl_vote ON tcl_vote.works_id = tcl_works.works_id
GROUP BY
tcl_works.school_id
HAVING
votes > @votes
ORDER BY
votes DESC
)
AS xxx
);
IF @gt = 0
THEN
SET @rank = 1;
SELECT @rank AS rank;
ELSE
SET @lt = (
SELECT
COUNT(*)
FROM
(
SELECT
tcl_works.school_id,COUNT(tcl_vote.vote_id) AS votes
FROM
tcl_works
LEFT JOIN tcl_vote ON tcl_vote.works_id = tcl_works.works_id
GROUP BY
tcl_works.school_id
HAVING
votes < @votes
ORDER BY
votes DESC
)
AS xxx
);
IF @lt = 0
THEN
SET @rank =(SELECT COUNT(*) FROM tcl_school LIMIT 1);
SELECT @rank AS rank;
ELSE
SET @rank = (@[email?protected]);
SELECT @rank AS rank;
END IF;
END IF;
END;

call get_rank(1)

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