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what is the difference between primary key & foreign key?
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Answer / gajendra jain
A table can have only one Primery key but it can have any number of Foreign key.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / anand
Primary key is used to identify a row in a table and it
doesnot allow null values. It avoids duplication of rows.
whereas foreign key refers to a column or combination of
columns included in the defenition of referential integrity
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / abhishek ranjan
The main diference between primary key and the foreign key is that the primary key is a column or a set of columns that can be used to uniquely identify a row in a table while the foreign key is a column or a set of columns that refer to a primary key or a candidate key of another table. Foreign key mainly provides a method to link information in several tables. Another difference is that a table can have a single primary key, but it can have multiple foreign keys that can reference different tables.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / leang heng
Primary Key is a column or group of columns that determine
in each Record to make not null.
Foreign Key is Column that provide Relationship to Primary
Key between Entities or Table.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / praneeth
primary key helps in uniquely identifying the records in a table
a foreign key is a field that points to the primary key of another table which links one table to another table
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / aarti
Primary Key : It is a unique key of the table.Unique for
each record in the table(e.g ID).
Foreign Key : When a primary key is used as a reference key
in another table then it is called as a foreign key.It is
used to link two tables.
| Is This Answer Correct ? | 1 Yes | 2 No |
Answer / keyman
Foreign key = Florida Keys (Keys in a foreign land)
Primary Key = The main key you use to enter you home
| Is This Answer Correct ? | 12 Yes | 36 No |
If I have a select statment which retrives 2 rows, & that rows have the same data in all the fields except the last field and I want to merge the 2 rows to be in 1 row with concatenating the last field which have the different data.... eg: the 1st row has these fields: A-B-C the second row has: A-B-X ........ i want to merge the two row to be in one row like ----> A- B- C,X
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