Knowledge Walls
Gopal Rao
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Queries
How to select all column values from table in sql How to rename the column in SQL How to create table in SQL How to add a new column to table in SQL How to change the data type of the column in SQL How to delete/remove column from table in SQL How to remove/delete the column(truncate) values from Table in SQL
Queries [cont'd]
How to delete table from database in SQL How to use select command in SQL How to add default value to the column in SQL How to add current system date and time to the column in SQL How to insert the values to the table columns in SQL How to create primary key to column in SQL How to create the foreign key for column in SQL
Queries [cont'd]
Referencing a foreign key to the primary key of the same table How to select the maximum value from sql column How to create a column with auto increment in sql server Identity column in sql server example Where condition in sql query And query in sql server Not like query in sql server
Queries [cont'd]
Or and and condition in sql server Like in sql server Using like and in sql together Subquery in sql server example Distinct in sql server example Having clause in sql server examples Count in sql server example
Queries [cont'd]
Truncate stored procedure sql server Create table in stored procedure sql server Delete / drop table in stored procedure sql server
Subquery in sql server example in Queries of SQL Queries
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Hints 
Sub query,In which query present inside query.Sub query normally written in where condition.The selected value from sub query act as a value to the where condition for main query.

In following example, The dept_no select by sub query act as value in where condition main query.
Syntax
select columnName from tableName where columnName=(select columnName from tableName where columnName='value');
Example
Get the employee numbers of all employees whose departments are located in Seattle.

select emp_no from Empolyee where dept_no=(select dept_no from Department where location='seattle');
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