mysql - if语句中的if语句

Question

Name    Value   AnotherColumn
-----------
Pump 1  8000    Something1
Pump 1  1000    Something2
Pump 1  3000    Something3
Pump 2  3043    Something4
Pump 2  4594    Something5
Pump 2  6165    Something6

在此表中，我想在Name列上进行分组，并将输出命名为value_exist。

如果该名称组的任何值列中存在1000，则

value_exist将为1。所以输出将是：

Name    value_exist
-----------
Pump 1  1
Pump 2  0 

Answer 1

也许是这样的：

select name, MAX(CASE WHEN value=1000 THEN 1 ELSE 0 END) as value_exist
from your_table
group by name

Answer 2

还有一个：

select name , max(if(value=1000,1,0)) as value_exist
from table 
group by name;

Answer 3

select name, sum(value = 1000) as value_exist
from your_table
group by name