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SQL中MAX与GREATEST的区别
2022-07-04 22:05:00 【By Moon】
greatest()求的是某几列的最大值，横向求最大；
max()通常用于返回列中的最大值，纵向求最大。
如果你试图将一个参数传递给greatest()，你将得到一个错误。
GREATEST(a,b,c)
MAX(a)- MIN和LEAST同理
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