感谢XXTV不？嘿嘿~~~开个玩笑~~- mysql in 子查询 效率慢 优化
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- ,
max(if(answer = 'A',content,'')) as 'A',
max(if(answer = 'B',content,'')) as 'B',
max(if(answer = 'C',content,'')) as 'C',
max(if(answer = 'D',content,'')) as 'D'
from tbl1
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