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这是我的数据库表。我想要检索水平键值为垂直。从数据库检索数据为verital
city_id cat_id value
100 1 1000
100 2 2000
101 1 350
101 2 500
102 1 1000
102 2 2000
103 1 10
104 2 5
输出:
city_id catagory1 catagory2
100 1000 2000
101 350 500
102 1000 2000
103 10 0
104 0 5
不正是...... http://sqlfiddle.com/#!2/ce8a1/1 – djot
'GROUP BY city_id'做它...的http:/ /sqlfiddle.com/#!2/ce8a1/3 ...现在谁得分?对... – djot
对,现在我已经完成了自己! ;)你得到分数! :) – kmas