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SELECT @row_number:=CASE WHEN @customer_no = customerNumber THEN @row_number + 1 ELSE 1 END AS num, @customer_no:=customerNumber as CustomerNumber, paymentDate, ......
1 SET @row_number = 0; SELECT (@row_number:=@row_number + 1) AS num, firstName, lastName FROM employees LIMIT 5; 2 SELECT (@row_number:=@row_number + 1) AS num, firstName, lastN...
准备 /* Navicat Premium Data Transfer Source Server : root Source Server Type : MySQL Source Server Version : 50725 Source Host : localhost:3306 Source Schema : ......
SELECT max( CASE dw WHEN 2 THEN dm END ) AS Mo, max( CASE dw WHEN 3 THEN dm END ) AS Tu, max( CASE dw WHEN 4 THEN dm END ) AS We, max( CASE dw WHEN 5 THEN dm END ) AS Th, max( C...
判断2月份是不是28天 SELECT DAY ( LAST_DAY( DATE_ADD( DATE_ADD( DATE_ADD( CURRENT_DATE, INTERVAL - DAYOFYEAR( CURRENT_DATE ) DAY ), INTERVAL 1 DAY ), INTERVAL 1 MONTH ) ) ) FROM...
创建透视表t500 建表 CREATE TABLE t500 ( id int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (id) ) ENGINE=InnoDB AUTO_INCREMENT=501 DEFAULT CHARSET=latin1; 插入500条数据 CREATE DEF...
设表名为TABLENAME,字段名为FIELD1则: SELECT FIELDN = FIELD1 FROM TABLENAME WHERE NOT EXISTS ( SELECT FIELD1 FROM TABLENAME A WHERE A.FIELD1 = tablename.field1 + 1 ) UNION SELECT...
1.CREATE USER 'json'@'localhost' IDENTIFIED BY '123456'; 2.GRANT ALL PRIVILEGES ON * . * TO 'json'@'localhost'; 3.FLUSH PRIVILEGES; 4.use mysql; 5.update user set Host='%' where...
UPDATE base_teacher_attendance_schedule JOIN base_attendance_setting_record ON base_teacher_attendance_schedule.recordsettingid = base_attendance_setting_record.id SET base_teac...
DELIMITER $$ create function sayhello() returns varchar(200) begin return 'hello boy'; end$$ DELIMITER ;...
需求是这样的(CSDN上的一个问题):mysql中有个表:article(字段:id,type,date),type有1-10,10种类型。现在要用SQL找出每种类型中时间最新的前N个数据组成的集合。 这个问题应该有很多...
select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)...
刷新表 call sysproc.admin_cmd ( 'reorg table SCM_BASECATEGORY' ) 重新设置设置主键初始值 alter table SCM_BASECATEGORY alter column BASECATEGORY_ID restart with 317; DB2展示分组...
方法1 使用 not in ,容易理解,效率低 select distinct A.ID from A where A.ID not in (select ID from B) 方法2 使用 left join...on... , "B.ID isnull" 表示左连接之后在B.ID 字段为 nu...
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