IN A TABLE HAVE ONE COLUMN PRIMARY KEY..IT WILL NOT ALLOWS NULL VALUES AND DUPLICATE VALUES..INSTEAD OF PRIMARY KEY WHY CANT WE USE UNIQUE AND NOT NULL.THESE TWO ALSO DOESNT ACCEPT NULL VALUES IN NOT NULL AND UNIQUE DOESNT ACCEPT DUPLICATE VALUES? SO WHAT IS THE DIFEERENCE BETWEEN(UNIQUE,NOT NULL) AND PRIMARY KEY??????
8 8808Post New rsystems SQL PLSQL Interview Questions
what is the difference between let, var, and const?
Explain routers?
define SWOT?
What does apostrophe mean in excel?
What is autograph ?
How to extract bacteria from HUT TEST ?
What is name of first file the loaded when yii 2.0 framework starts?
How do I enable equations in word?
What are do's and dont's of Interface?
What are some new input attributes in HTML5?
What does left function do in excel?
What are all the commands used with Data Adapter?
What are main etl functions that can be performed in designer tool?
How you build object repository in your project?
How can we fetch top 5 opportunity according to the amount?
