Question

我正在尝试运行一个不会显示不同/重复值的SQL查询。

例如，如果使用distinct选项，它只显示一个唯一的结果，但我想跳过所有检测到的不同值，即不显示不同的值

有可能吗？

    select col1  d from tb_col  where col1 = '123';

col1
------
123
123


(2 rows)


select distinct col1  d from tb_col  where col1 = '123';

col1
------
123
(1 row)

Answer 1

SELECT col1 
FROM tb_col 
GROUP BY col1 
HAVING count(*) = 1

Answer 2

根本不显示重复项：

SELECT col1 AS d
FROM tb_col
GROUP BY col1
HAVING COUNT(*) = 1            --- or perhaps HAVING COUNT(*) > 1
                               --- it's not clear what you want.

Answer 3

  select col1
  from tb_col
  group by col1
  having count(*) < 2

Answer 4

尝试 DISTINCT 它会起作用！

SELECT DISTINCT(col1) as d from tb_col  where col1 = '123';

mysql忽略任何不同的值

4 个答案: