[英]Sql Query On Joining 3 tables
I created 3 table as follows 我创建了3张表,如下
Table Student1: 表学生1:
id status amount Name date
1 0 4500 ram 04/02/2012
2 0 2000 shyam 05/09/2013
4 0 1500 ghanshyam 08/11/2014
Table Student2: 表Student2:
id status amount Name date
3 0 4500 gopal 04/02/2012
2 0 8000 radheshyam 15/11/2013
4 1 1500 ghanshyam 18/10/2015
Table Student3: 表学生3:
id status amount Name date
1 1 4500 ram 04/02/2012
2 0 6500 radhe 11/11/2014
3 1 4500 gopal 04/02/2012
Excepted Result Condition: 例外结果条件:
1)Select Records with unique "id" from combining 3 tables. 1)从3个表中选择具有唯一“ id”的记录。
2)Update Field "date" of corresponding record if status=1 of same record with same name,amount in any of the 3 Tables. 2)如果相同名称的同条记录的status = 1,则更新对应记录的字段“日期”,金额在3个表中的任何一个。
3)If 2 or more than 2 record after combining 3 tables with same "id" but other fields different(ie Same id but different name,amount,date) then add all them to final result but my appending 1,11,111 to them. 3)如果在将3个具有相同“ id”但其他字段不同的表合并后(即相同id但名称,金额,日期不同)将2个或2个以上记录组合在一起,则将它们全部添加到最终结果中,但我将1,11,111附加到最终结果中。
Final Result To be Expected: 预期的最终结果:
id status amount Name date
1 1 4500 ram 04/02/2012
2 0 2000 shyam 05/09/2013
21 0 8000 radheshyam 15/11/2013
211 0 6500 radhe 11/11/2014
3 1 4500 gopal 04/02/2012
4 1 1500 ghanshyam 18/10/2015
Sql Fiddle SQL小提琴
CREATE TABLE Student1
(`id` int,`status` int,`amount` int , `Name` varchar(10), `date` varchar(55))
;
INSERT INTO Student1
(`id`,`status`,`amount`, `Name`, `date`)
VALUES
(1,0,4500, 'ram', '04/02/2012'),
(2,0,2000, 'shyam', '05/09/2013'),
(4,0,1500, 'ghanshyam', '08/11/2014')
;
CREATE TABLE Student2
(`id` int,`status` int,`amount` int , `Name` varchar(10), `date` varchar(55))
;
INSERT INTO Student2
(`id`,`status`,`amount`, `Name`, `date`)
VALUES
(3,0,4500, 'gopal', '04/02/2012'),
(2,0,8000, 'radheshyam', '15/11/2013'),
(4,1,1500, 'ghanshyam', '18/10/2015')
;
CREATE TABLE Student3
(`id` int,`status` int,`amount` int , `Name` varchar(10), `date` varchar(55))
;
INSERT INTO Student3
(`id`,`status`,`amount`, `Name`, `date`)
VALUES
(1,1,4500, 'ram', '04/02/2012'),
(2,0,6500, 'radhe', '11/11/2014'),
(3,1,4500, 'ghanshyam', '04/02/2012')
;
Query: 查询:
SELECT * FROM Student1
FULL OUTER JOIN Student2
ON Student1.Name = Student2.Name
Error: 错误:
check the manual that corresponds to your MySQL server version for the right syntax to use near 'OUTER JOIN Student2 ON Student1.Name = Student2.Name' at line 2
这只是这三个表之间的联合。
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