2020-02-16 标签:sql,语句,查询,数据库,重复记录,个数,实现,代码,如下,select,a,b,c,count,test,having,group,zdbh,tdzl

实现代码如下：select a,b,c,count(*) from (select c.a,c.b,c.c from test c) having count(*) >= 2 group by a,b,c 或者 实现代码如下：select zdbh,tdzl,zdmj,count(*) fro

2020-02-16 标签:asp,n,et,sql,数据库,处理,函数,命令,先写,统计,实现,代码,如下,public,static,int,count,string,cityname,cmdtext

先写一个数据库统计函数 实现代码如下： public static int Count(string cityName) { string cmdText = ""; SqlConnection conn = new SqlConnection(DBH.DBA); SqlCommand cmd =

2020-02-16 标签:discuz,phpmysql,操作,实现,代码,如下,php,mysql,数据库,连接,class,2009,04,15,hackbaby,dbstuff,var,version

实现代码如下： link = @$conn($dbhost, $dbuser, $dbpw, 1)) { $halt } else { if($this->version() > '4.1') { global $charset, $dbcharset; $dbcharset = $d

2020-02-16 标签:php,入门,学习,几个,不错,实例,代码,连接数,dbhost,localhost,dbuser,root,mysql,用户名,dbpass,123456,密码

1,php连接数据库 2.php读取数据库中,某一字段值 \n", mysql_result($result,3,"UserName")); printf("密码: %s\n", mysql_result($result,3,"UserPass")); ?> 3,php插入某一条数据 4,

2020-02-16 标签:perl,学习,资料,整理,null,值的,判断,t,type,id,pref,dbh,selectrow,array,select,enq

NULL值的判断 $t{type1id} = $$pref{dbh}->selectrow_array("SELECT type1id FROM enq1 WHERE id = 3"); if ( $t{type1id} == 0 ) { print "Type1id is NULL\n";