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i have 3 tables named as registration , lkg and ukg now i want total data from these tables.
i used the following query
select * from registration,lkg,ukg.
it displays out put but all those data displayed in 3 times
how can i retrieve this data
...........
thank you
Posted

Use Inner Join To Reduce Your Problem
 
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See this recent answer and follow the link mentioned there : How to get data from two tables[^]
 
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The syntax you are using here is called 'implicit cross join' and that IS a cross join after all and for that it displays all combination of data can be produced from the tables you have. As you have 3 tables you see data 3 times...
You have to learn about SQL joins and how to use them...
http://en.wikipedia.org/wiki/Join_(SQL)[^]
Visual Representation of SQL Joins[^]
 
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Comments
Member 11065510 7-Oct-14 7:48am    
my problem is these three tables contain same column names
Kornfeld Eliyahu Peter 7-Oct-14 7:50am    
That is the good part! But sing fully qualified column names can get you over it!
MyTable1.Id, MyTabl2.Id and so on...

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