select count() from table1 select count() from table2 sele

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select count(*) from table1 select count(*) from table2 select count(*) from table3
我从table1 table2 table3 中找数据的条数
怎样一下子用一条sql语句算出TABLE1 TABLE2 TABLE3 记录的总和?

select sum(c) from (
select count(*) c from table1
UNION select count(*) c from table2
UNION select count(*) c from table3
) t
使用UNION将三条查询的结果合并,再外套一层求和.

select count(*) from table1 select count(*) from table2 sele select * from table1,table2 where table1.sn=table2.sn(+)我想知道 select count(*) from 怎么使用 select count(1) from emp select count(c) from (select b from TUserBankLogSum b group select telnum,count(0),count(distinct othertelnum) from nmk. SQL语句理解 select * from B where (select count(1) as num from A SELECT sum(1) FROM table;和SELECT count(1) FROM table; select count() into :r_count from zw_kmyeb where km_code lik select count(*) as total from 'test' order by id desc SQL >select count(*) from Teacher where teacherCode=? and te select count(*) as total from ddcm_news where key=a