group=conn("works_group") 没有记录改为：<% Dim group connSource = "selectfrom dboteacher where tea_group=&#

update t_time t1set t1.Bks=(select max(t2.EndTime) from t_diaoyonglian0703 t2 where t1.TraceID=t2.TraceID and t2.Site=&#

你修改的那条记录id=10是吧，修改如下：select  htmlcall from  表  where htmllcall = 'helloworld.html' and id&lt&gt10？？不用

select class,total,name from (select *,ywsc+sxsc as total from st ORDER BY total DESC) b where not EXISTS(select * from

可以在mysql的 infomation_schema库中的columns表中查总列数。SELECT count(COLUMN_NAME) as num FROM `COLUMNS` where TABLE_NAME='pj_ex

update t_time t1set t1.Bks=(select max(t2.EndTime) from t_diaoyonglian0703 t2 where t1.TraceID=t2.TraceID and t2.Site=&#

CREATE OR REPLACE PROCEDURE get_dept (p_deptno IN VARCHAR2, p_dname OUT VARCHAR2, p_loc OUT VARCHAR2)IS l_rate NUMBE

update t_time t1set t1.Bks=(select max(t2.EndTime) from t_diaoyonglian0703 t2 where t1.TraceID=t2.TraceID and t2.Site=&#

统计所有记录的数量：SELECT COUNT(*) FROM table_name统计某列的数量：SELECT COUNT(column_name) FROM table_namewhere 条件select proxxx,count(lo

update t_time t1set t1.Bks=(select max(t2.EndTime) from t_diaoyonglian0703 t2 where t1.TraceID=t2.TraceID and t2.Site=&#

试试这个方法：use information_schemaselect table_name,table_rows from tables where TABLE_SCHEMA = 'testdb' order by t

SELECT m.user_id, b_total, c_total, d_total FROM a m, (SELECT user_id, COUNT(*) b_total FROM b GROUP BY user_id) n, (SEL

select hour(create_time) AS saleHour, count(id) AS saleCount from tableName where date_format(create_time, ‘%Y-%m-%d’

按照描述这么写：update 表名 t1set t1.name=(select name from 表名 t2where t2.pid=t1.pid and t2.name is not null and rownum=1)where t

$link=mysql_connect(*********)$sql="SELECT count FROM `test` WHERE value = 10000"$result=mysql_query($sql,$lin

update t_time t1set t1.Bks=(select max(t2.EndTime) from t_diaoyonglian0703 t2 where t1.TraceID=t2.TraceID and t2.Site=&#

update t_time t1set t1.Bks=(select max(t2.EndTime) from t_diaoyonglian0703 t2 where t1.TraceID=t2.TraceID and t2.Site=&#

$link=mysql_connect(*********)$sql="SELECT count FROM `test` WHERE value = 10000"$result=mysql_query($sql,$lin

前天写SQL时本想通过 A left B join on and 后面的条件来使查出的两条记录变成一条，奈何发现还是有两条。后来发现 join on and 不会过滤结果记录条数，只会根据and后的条件是否显示 B表的记录，A表的记录一定