Mysql存储过程中循环内的Select语句
我们可以在Mysql存储过程的循环中使用Select语句吗 为什么代码是错误的Mysql存储过程中循环内的Select语句,mysql,sql,date,stored-procedures,Mysql,Sql,Date,Stored Procedures,我们可以在Mysql存储过程的循环中使用Select语句吗 为什么代码是错误的 create procedure AbsentReportproc (INOUT fromdate DATETIME, INOUT todate DATETIME) as begin DECLARE startdate DATE; DECLARE enddate DATE; DECLARE nofdays INT; DECLARE counter INT; DECLARE countdate DATE; start
create procedure AbsentReportproc (INOUT fromdate DATETIME, INOUT todate DATETIME)
as
begin
DECLARE startdate DATE;
DECLARE enddate DATE;
DECLARE nofdays INT;
DECLARE counter INT;
DECLARE countdate DATE;
startdate=fromdate;
enddate=todate;
countdate=fromdate;
nofdays=DATEDIFF(DAY,startdate,endate);
counter=1;
while counter<=noofdays
loop
select CARDNO from test_prefixmaster
where CARDNO not in ( select CARDNO from test_prefixtransactions where Date(S_DateTime)=countdate)
set countdate=countdate+1;
set counter=counter+1;
end loop;
end//
创建过程AbsentReportproc(INOUT-fromdate-DATETIME,INOUT-todate-DATETIME)
作为
开始
宣布开始日期;
宣布截止日期;
宣布无日期;
声明计数器INT;
宣布日期;
起始日期=起始日期;
enddate=todate;
countdate=fromdate;
nofdays=日期差(天、开始日期、结束日期);
计数器=1;
当计数器时,尝试以下操作:
DELIMITER $$
DROP PROCEDURE IF EXISTS `AbsentReportproc`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `AbsentReportproc`(IN _fromdate DATETIME, IN _todate DATETIME)
BEGIN
CREATE TEMPORARY TABLE daterange (dte DATE);
SET @counter := -1;
WHILE (@counter < DATEDIFF(DATE(_todate), DATE(_fromdate))) DO
INSERT daterange VALUES (DATE_ADD(_fromdate, INTERVAL @counter:=@counter + 1 DAY));
END WHILE;
SELECT tp.cardno, tp.EMPCODE, tp.DEPARTMENT, GROUP_CONCAT(d.dte) Absentddate, COUNT(tp.cardno) Totalnoofabsentdates
FROM test_prefixmaster tp JOIN daterange d
LEFT JOIN test_prefixtransactions tpt ON tp.cardno = tpt.CARDNO AND DATE(S_DateTime) = d.dte
WHERE tpt.CARDNO IS NULL
GROUP BY tp.cardno;
DROP TABLE daterange;
END$$
DELIMITER ;
分隔符$$
删除过程(如果存在)`AbsentReportproc`$$
CREATE DEFINER=`root`@`localhost`PROCEDURE`AbsentReportproc`(IN\u fromdate DATETIME,IN\u todate DATETIME)
开始
创建临时表日期范围(dte日期);
设置@counter:=-1;
而(@counter
这不需要循环。你可以这样做:
SELECT
p.CARDNO,
COUNT(CARDNO) AS countdate
FROM test_prefixmaster p
INNER JOIN test_prefixtransactions t ON p.CARDNO = t.CARDNO
WHERE Date(t.S_DateTime) BETWEEN fromdate
AND todate
GROUP BY p.CARDNO;
我们可以在while循环中使用Select语句吗?可以,但它将返回noofday time表的输出。表示noofdays的值比output contans 4表的值大4。在过程中使用while循环的原因是什么。解释你想对表结构、样本数据和输出做什么。我有两个表1)test_prefixmaster和2)test_prefixtransactions,我想找到在两个给定日期之间缺席的员工?事务表包含在特定日期时间出现的记录,如果员工不在办公室,则不会在事务表中插入任何记录?我想查找两个给定日期的Empcode、部门、名称、缺席日期?