本文介绍了查询给出重复的结果?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是我的查询:
SELECT b.id,b.body FROM btin b
INNER JOIN nwork n ON (n.mem_id = b.mem_id)
WHERE b.parentid = '0'
AND ('401' IN (n.frd_id, b.mem_id))
ORDER BY b.date DESC
LIMIT 20 OFFSET 0
问题在于它的打印重复结果.我该如何优化这个
the problem is its printing duplicate result.How can I optimize this one
请帮忙谢谢
推荐答案
解决这个问题的三种方法(基本上你在 nwork 中有超过 1 行):
Three ways to solve this (basically you have more than 1 row in nwork):
SELECT distinct b.id,b.body FROM btin b
INNER JOIN nwork n ON (n.mem_id = b.mem_id)
WHERE b.parentid = '0'
AND ('401' IN (n.frd_id, b.mem_id))
ORDER BY b.date DESC
LIMIT 20 OFFSET 0
SELECT b.id,b.body
FROM btin b
Where b.id in (SELECT b.id FROM btin b INNER JOIN nwork n ON (n.mem_id = b.mem_id)
WHERE b.parentid = '0' AND ('401' IN (n.frd_id, b.mem_id)))
ORDER BY b.date DESC
LIMIT 20 OFFSET 0
SELECT b.id,b.body FROM btin b
INNER JOIN nwork n ON (n.mem_id = b.mem_id)
WHERE b.parentid = '0'
AND ('401' IN (n.frd_id, b.mem_id))
Group by b.id, b.body, b.date
ORDER BY b.date DESC
LIMIT 20 OFFSET 0
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