When is a declare statement required?
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Explain dml and ddl?
What trigger means?
What is the first action to perform a query? Suppose I have four tables and five joins and my query is getting slow day by day.
what is Hash join?how it is different from inner join?what is the sign used for inner join?(eg: like the (+) sign used for outer join)?
how many tables will create when we create table, what are they? : Sql dba
Explain unique key in sql.
What is a pdo connection?
What does <> sql mean?
How many primary keys can a table have?
i have 2 table table one 4 columns respective values a1 7,a2 6,a3 8 ,a4 12 & table two 4 colums respective values a1 7,a2 6,a3 8,a4 15.if table one & table two 3 colums same then 4th column values 1)Qes diff >5 then print 5 * diff value 2)Que diff <5 print 5
Is sql better than excel?
What is primary key secondary key alternate key candidate key?
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