Personal Tech Journal

1. Table variables are similar to the normal tables or temporary tables. 2. This is good if you don’t want to store large data for temporary use. 3. These are only available during the execution of the program. 4. The Syntax is as follows DECLARE @< Variable_Name > TABLE >(< ColumnName1 > < Datatype >,< ColumnName2 > < Datatype >…) 5. The below shows the example to use table variables DECLARE @temp_employee TABLE(EmployeeID int PRIMARY KEY, FirstName varchar(50), LastName varchar(50), Sex char(1), Age int DEFAULT 18, DateOfBirth DateTime) SELECT * FROM @temp_employee

1. Temporary Tables are similar to tables unlike they are life is only for the current session and it will be automatically dropped after that. 2. This is very useful for storing some information during a large computations temporarily instead of using physical tables. 3. They cannot have foreign key constraints. 4. It is stored in the TempDB. 5. The Syntax is CREATE TABLE #< TableName >(< ColumnName1 > < Datatype >,< ColumnName2 > < Datatype >…) 6. The below shows an example how to create a temporary table CREATE TABLE #tempEmployees(EmployeeID int PRIMARY KEY, FirstName varchar(50), LastName varchar(50), Sex char(1), Age int CONSTRAINT df DEFAULT 18, DateOfBirth DateTime)