"SELECT 1 FROM identity_approve WHERE identity_num=' " . trim($_POST['IDnumber']) . " ' AND user_id !=".trim($_POST['uid']); 到底会有什么输出? select 1 from table; select xxx(表集合中的任意一行) from table; select * from table 从作用上来说是没有差别的,都是查看是否有记录,一般
hive建表语句DML:https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-CreateTable 创建表: hive> CREATE TABLE pokes (foo INT, bar STRING); Creates a table called pokes with two columns, the first being an integer and
--问题求 集合中每天最大时间的总和 表中的数据 列: 用户 分数 时间 A 2 2014-01-01 01:00:00 A 2 2014-01-01 02:00:00 A 2 2014-01-01 03:00:00 A 2 2014-01-02 01:00:00 A 2 2014-01-02 02:00:00 A 2 2014-01-02 03:00:00 A 2 2014-01-03 02:00:00 A 2 2014-01-03 03:00:00 A 2 2014-01-04 01:00:
SELECT COUNT(l.LogSeq), date_format(l.CreateDate,'%Y-%m') CreateDateByMonth FROM LOL l WHERE l.CreateDate>='2017-1-1' AND l.CreateDate<='2017-8-16' GROUP BY CreateDateByMonth 把数据按照月份分组获取所需要的数据SQL语句变为EF,错误的写法: //先做基本查询 var querySql = from l in LOL se