mysql 一个sql 返回多个总数

Question

文章链接：https://segmentfault.com/a/11...
说道：
一个sql 返回多个总数
$sql = "select count(*) all, " ;
$sql .= " count(case when status = 1 then status end) status_1_num, ";
$sql .= " count(case when status = 2 then status end) status_2_num ";
$sql .= " from table_name";

疑问：这条sql是否有问题，我去尝试了，报错，以前类似查询我都用多天sql的，这种都没写过，疑问多多！

Answer 1

all is indeed the keyword, just change it
If you want the total number of each statusselect status,count(*) status_num from table where status in (1,2) group by status;

Answer 2

Use AS for alias
count(*) AS number

Answer 3

There is a problem with select count(*) all
all is the keyword of mysql, just change it to another name