postgresql 函数获取多个字段的数字大小值

2024年5月3日 219次阅读 来源: PostgreSQL

1、GREATEST(n1,n2,n3,……….) 获取最大值

testdb=#SELECT GREATEST(3,5,1,8,33,99,34,55,67,43); 
+---------------------------------------------------------+ 
| GREATEST(3,5,1,8,33,99,34,55,67,43)                     | 
+---------------------------------------------------------+ 
| 99                                                      | 
+---------------------------------------------------------+ 
1 row in set (0.00 sec)

2、LEAST(N1,N2,N3,N4,……) 获取最小值

testdb=#SELECT LEAST(3,5,1,8,33,99,34,55,67,43); 
+---------------------------------------------------------+ 
| LEAST(3,5,1,8,33,99,34,55,67,43)                        | 
+---------------------------------------------------------+ 
| 1                                                       | 
+---------------------------------------------------------+ 
1 row in set (0.00 sec)

其他更多函数参考：http://developer.51cto.com/art/201401/426252_all.htm

 

    原文作者：PostgreSQL
    原文地址: https://www.cnblogs.com/liqiu/p/4484071.html
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