Sql have Several Query for interect with Database.
Select Query is one of the most important Query here we will see the different Uses of Select Query.
* To simply select the all Datas from Database Table
select * from table_name
above statements select all the rows from Data Table.
* To count just number of rows(all) from table
select count(*) from table_name
above query count all the rows from given table
* now if you want count distinct rows from table you have to specify distinct word before count key word
like
select count( distinct column_name) from table_name
above query remove duplication from count result .
* Use select method to insert data from one table to another table
insert into tbl_insert_table (first_column , last_column)
select first_value , last_value from tbl_select_table
Select Query is one of the most important Query here we will see the different Uses of Select Query.
* To simply select the all Datas from Database Table
select * from table_name
above statements select all the rows from Data Table.
* To count just number of rows(all) from table
select count(*) from table_name
above query count all the rows from given table
* now if you want count distinct rows from table you have to specify distinct word before count key word
like
select count( distinct column_name) from table_name
above query remove duplication from count result .
* Use select method to insert data from one table to another table
insert into tbl_insert_table (first_column , last_column)
select first_value , last_value from tbl_select_table
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