how to do multiple COUNT(*) SELECTS
from the same table in one ...
$query = "SELECT count(*) FROM content_form WHERE read_flag = 0 ";
$query = "SELECT count(*) FROM content_form WHERE read_flag = 1 ";
$query = "SELECT count(*) FROM content_form WHERE read_flag = 0 ";
$query = "SELECT sum(Case when read_flag=0 then 1 else 0 end) as ReadFlag0Cnt,
sum(Case when read_flag=1 then 1 else 0 end) as ReadFlag1Cnt
FROM content_form";
You can use case statement
尝试这个
SELECT read_flag,count(read_flag) as cnt FROM content_form WHERE read_flag IN (0,1,....) GROUP BY read_flag
You may try this:
$query = "select (SELECT count(*) FROM content_form WHERE read_flag = 0)
as flag0, (SELECT count(*) FROM content_form WHERE read_flag = 1) as flag1,
(SELECT count(*) FROM content_form WHERE read_flag = 0) as flag0) from content_form";
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