Answer / Pushpendra Chaturvedi

"Emotional triggers" in this context do not relate to SQL or PLSQL. They refer to stimuli that provoke emotional responses in humans. Common examples include criticism, praise, rejection, and positive reinforcement.

how to achieve this problem?i am having table with two colums like empno,gender. in gender column, i am having records male,female like that .my final output will be male female 5 6

4 Answers   Hexaware,

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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 Answers   rsystems,

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