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[英]MySQL: i need to pull the same column name from multiple rows into single query based on same conditions
[英]Mysql query return rows based on multiple column in same table
我有这样的桌子
Post_ID KEY Value
1 year 2014
1 month 09
2 year 2014
2 month 10
3 year 2014
3 month 09
在此表中,我有post_id,键(表示发布的年份和月份)和值(表示年份值和月份值)
我想返回发布的所有post_ID,分别为“ 2014”和“ Month”为“ 09”,这意味着我的值为1和3。
我会计算有多少个属性与此规范匹配,并使用一个having
子句过滤其count
:
SELECT post_id
FROM my_table
WHERE (key = 'year' AND value = '2014') OR
(key = 'month' AND value = '09')
GROUP BY post_id
HAVING COUNT(*) = 2
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