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How to fetch only selected column from a database table? | Basic MySQL Queries #shorts [Hindi]
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How to fetch only selected column from a database table? | Basic MySQL Queries #shorts [Hindi]
Retrieving a Subset of Columns from a Table
Problem
You have a table and want to see values for specific columns rather than for all the
columns.
Solution
Specify the columns you are interested in. For example, to see only name, department
number, and salary for employees:
1 select ename,deptno,sal
2 from emp
Discussion
By specifying the columns in the SELECT clause, you ensure that no extraneous data
is returned. This can be especially important when retrieving data across a network,
as it avoids the waste of time inherent in retrieving data that you do not need.
Retrieving a Subset of Columns from a Table
Problem
You have a table and want to see values for specific columns rather than for all the
columns.
Solution
Specify the columns you are interested in. For example, to see only name, department
number, and salary for employees:
1 select ename,deptno,sal
2 from emp
Discussion
By specifying the columns in the SELECT clause, you ensure that no extraneous data
is returned. This can be especially important when retrieving data across a network,
as it avoids the waste of time inherent in retrieving data that you do not need.
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