HI ALL PRIMARY KEY :- UNIQUE+NOT NULL UNIQUE kEY :- UNIQUE +NULL

wahts is mean by primary key and unique key?

Question Posted / seshu

Answer Posted / seshu

HI ALL

PRIMARY KEY :- UNIQUE+NOT NULL

UNIQUE kEY :- UNIQUE +NULL

Is This Answer Correct ?

13 Yes

0 No

Please Help Members By Posting Answers For Below Questions

What is the use of getGeneratedKeys() method in Statement?

1019

Explain about the Try Block?

989

What is the difference between client and server database cursors?

1180

Is it possible to connect to multiple databases simultaneously?

1069

What is a jdbc connection?

898

What is jdbc and jpa?

1007

What is JDBC Connection? Explain steps to get Database connection in a simple java program.

1183

What is the purpose of the jdbc resultset interface?

916

What should be done for auto generating primary key id in a table ?

975

Where can I find ojdbc14 jar file?

996

What do you understand by jdbc statements?

1038

What is jdbc and odbc in java?

915

Where is jdbc used?

984

Give a way to check that all result sets have bin accessed and update counts are generated by execute method.

963

I have the choice of manipulating database data using a byte[] or a java.sql.blob. Which has best performance?

937