Explain the the delete statements in sql?
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What is the use of index in hive?
What is a unique key?
How to fetch alternate records from a table?
What is the difference between delete and truncate commands?
Name Salary Abc 50000 Abc 50000 xyz 20000 find the max salary using aggregate function?
Why primary key is required?
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Create table emp (id number(9), name varchar2(20),salary number(9,2)); The table has 100 records after table created.Now i nee to change id's Datatype is to be Varchar2(15). now Alter table emp modify(id varchar2(15),name varchar2(20), salary number(9,2)); Whether it will work or returns error? post answer with explanation.
What is full join in sql?
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