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what is primary key,unique key, foreign key? can u teach me
in simple language?
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Answer Posted / patel gopikumar
PRIMARY KEY : it is a key that not allow null value in database tables field....
UNIQUE KEY : it is a key that store or manage data uniquely...
FOREIGN KEY : it is key that use is...connect two fields in the different tables........with foreign key......
thnks........
s-150907-007 PATEL GOPIKUMAR
| Is This Answer Correct ? | 5 Yes | 12 No |
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First input columns brand, mt, re values are ov, 1,re vg, 2,re wu ,3,re. Second input columns are brand, mt, cx their records are ov,4,vg ,5,cx Wu, 6,cx and third input columns brand, mt, rt values are ov,7,rt vg, 8,rt wu, 9,rt but my output is brand, re, cx,rt values are ov, 1,4,7 vg, 2,5,8 wu, 3,6,9
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