获取MySQL中具有特定值的列数

Question

I need to get the count of a column for a particular id, but only when the column value is "Yes". Following is wrong i guess. mid(PRIMARY KEY)

SELECT COUNT(mt.currentstate = 'Yes') AS currentstate FROM mytable mt WHERE mid = 100 GROUP BY mid;

For the COUNT value only i need from the column mt.currentstate = 'Yes', but for the ResultSet I need to get all the values where mt.currentstate = 'Yes' or 'No'

Answer 1

You can try below query, it will work if i'm not worng.

SELECT COUNT(mt.mid) AS counter FROM mytable mt WHERE mid = 100 AND mt.currentstate = "YES" GROUP BY mid;

Thanks!

Answer 2

Try this:

SELECT COUNT(*) AS currentstate FROM mytable WHERE mid = 100 AND currentstate='Yes';

EDIT: "Now If i put mt.currentstate = 'Yes' inside WHERE clause, it will filter all the rows where mt.currentstate = 'Yes', but I need other column values from the rows mt.currentstate = 'No'..What I'm gonna do?"

SELECT currentstate, COUNT(*) AS c FROM mytable WHERE mid = 100 GROUP BY currentstate;

Answer 3

SELECT COUNT(mt.mid) AS currentstate FROM mytable mt
WHERE mid = 100 and mt.currentstate = 'Yes' GROUP BY mid;