15. Difference between Temp Table and Table Variable and CTE| Temporary table vs Table variable

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This Video contains In-depth coverage of Temp Table and Table Variable and CTE in SQL. Covers all of the important queries and SQL commands. In this videos series, you'll learn how to read and write complex queries. Handle tricky SQL interview questions. Implement complex SQL queries and answer popular interview questions on SQL. These videos series will help to crack interviews and get jobs in SQL Developer, Database Developer, Data Engineer, Reporting Analyst, Data Analyst, Data Scientist, System Analyst, Power BI Developer, Tableau Developer, BI Developer, etc.
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Temporary Tables in SQL Server: A temporary table in SQL Server, as the name suggests, is a database table that exists temporarily on the database server. A temporary table stores a subset of data from a normal table for a certain period of time.
Temporary tables are particularly useful when you have a large number of Join. you can use minimum join and store it in a temporary table and again use temp table to join another's table.
Temporary tables are stored inside “tempdb” which is a system database.
Different Types of Temporary Tables:
SQL Server provides two types of temp tables based on the behaviour and scope of the table. These are:
Local Temp Table
Global Temp Table
Local Temp Table:Local temp tables are only available to the current connection for the user; and they are automatically deleted when the user disconnects from instances. Local temporary table name is stared with hash ("#") sign.
Syntax:
CREATE TABLE #LocalTempTable(
UserID int,
UserName varchar(50),
UserAddress varchar(150))
Global Temp Table: Global Temporary tables name starts with a double hash ("##"). Once this table has been created by a connection, like a permanent table it is then available to any user by any connection. It can only be deleted once all connections have been closed.
Syntax:
CREATE TABLE ##NewGlobalTempTable(
UserID int,
UserName varchar(50),
UserAddress varchar(150))
Table Variables In SQL Server: Table variables are objects similar to temporary tables and were introduced in SQL Server 2000. A table variable is declared using the table data type.
Syntax:
Declare @Employee table (empid int, EmpName Varchar(100))
insert into @Emp3(empid,EmpName) values (1,'Deepak’)
select * from @Emp3
Table variable not work independently. Need to select entire statement and execute it.
Difference Between Temporary Table and Table Variable in Sql Server:
Table variable (@table) is created in the memory. Whereas, a Temporary table (#temp) is created in the tempdb database. However, if there is a memory pressure the pages belonging to a table variable may be pushed to tempdb.
Table variables cannot be involved in transactions, logging or locking. This makes @table faster then #temp. So table variable is faster then temporary table.
Temporary Tables are not allowed in User Defined Functions. Table Variables can be used in User Defined Functions.
Temporary tables are allowed CREATE INDEXes whereas, Table variables aren’t allowed CREATE INDEX instead they can have index by using Primary Key or Unique Constraint.
We can use drop statement in temp table but we can’t use drop statement in table variable.
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[@mohdshareef8541]

very well explained

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Keep watching

[@mrityunjaypathak8792]

gr8 content, explained in the simple language, Thanks

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Glad you liked it

[@farukshaikh7858]

Great video Its so useful for me one mistake I want to clear here Global tempTable will be dropped automatically, iff closed or disconnected the instance where it is created. There is no need to close all the instances.

[@PandeyGuruji]

Yes, correct

[@engineersINnight]

Nice

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[@bindashji6748]

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[@berginsheni1717]

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