Answer / jagadish

In select single, you have to mention all the key fields in
where condition. Only in Select upto n rows there is no
need to specify all the key fields

Answer / sainath

There wont be many primary keys.only one primay key with
many fields combination.so you can use select single for the
field u want.

Answer / rams

when ever you are using select single you have to use all
primary key's, other wise it will give syntax error,

when you are using select UPTO N rows, there is no need to
use all primary key

Answer / ramjan shaik

A TABLE MUST HAVE ONLY ONE PRIMARY KEY.MORE THAN ONE
PRIMARY KEY NOT POSSIBLE TO GIVE TO THE TABLE.IF
GIVES,ERROR MESSAEG WILL DISPLAYS

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