*时间格式转换,使datetimepicker.js 能够搜索 查询 单个 年月日而不需是区间 查询. //另起一行看转换结果 select *,FROM_UNIXTIME(CreateTime,'%Y-%m-%d') as date from lg_recharge //where条件查询测试 select * from lg_recharge where FROM_UNIXTIME(CreateTime,'%Y-%m-%d') ='2017-06-27' //融合到整体查询中 select
作为小白的我,这个问题弄了半天才解决,特此记录下. 两张表:文章表和评论表 文章表(article):id 评论表(comment):id,c_aid 要求:查询出所有文章及评论数量然后降序显示(没有评论的文章的评论数量则返回为0) SQL:select A.id, ifnull(AC.comment_count, 0) as cont from b_articleinfo A LEFT JOIN (select c_aid, count(1) as comment_count from b_a
本文转载自:http://hi.baidu.com/ajyajyajy/item/4e2a7f4dc83393d2c1a592c1 use DBNAMEgoselect * from sysobjects where xtype='U'; --这是查询所有表的信息select count(*) from sysobjects where xtype='U' --这是查询表的数量 select a.name, b.rows from sysobjects a with(nolock) join
<select id="findUserInfoListForMap" resultMap="BaseResultMap"> SELECT p.name, u.u_name,u.company,u.proComany,u.mobile,u.email, r.money FROM iw_user u LEFT JOIN raiseentry r on r.userId=u.id LEFT JOIN project p on r.sourceId=
查询 <?php namespace Admin\Controller; use Think\Controller; class MainController extends Controller { public function showList() { echo "大苹果商城"; } public function test() { //数据访问 //造模型对象 //$nation = D("Nation");//连接数据库中的Nation表 //查询
1.查看数据库表数量SELECT count(TABLE_NAME) FROM information_schema.TABLES WHERE TABLE_SCHEMA='dbname'; 2.获取mysql下所有数据库表的数量 SELECT COUNT(*) TABLES, table_schema FROM information_schema.TABLES GROUP BY table_schema; 3.获取指定数据库的表的数量 SELECT COUNT(*) TABLES, tabl