What is a Temporary Table and its need in SQL?
SQL provides a good feature to store data or table temporarily in memory. Temporary Table means to store the complete or sub-part of a table in different table or database. This table store this information temporarily or a certain time of period.
Every DB Developer uses temporary tables. Temporary tables are very useful when you have a large number of rows in a table and you need to retrieve some records from the table, again and again, you need a hell of a time for that and also write a query again and again. It is very headache for a developer. You simply create a temp table for that data and just fetch that table rather than a big table. Temporary tables improve your DB performance and maintainability.
How to Create a Temporary Table in SQL
SQL provide a query for creating a temporary table in database, the syntax is given below
SELECT name of columns
INTO #temporary table name
FROM name of table
Where conditions [ optional ]
SELECT clause: In the select statement you can write the name of columns those you want to display in-store in a temporary table.
INTO clause: In into clause write the temporary table name.
FROM Clause: In into clause write the table name that data you want to store in a temporary table.
WHERE Clause: In where clause writes the condition it’s optional.
Example of a Temporary Table Query
How to create a Temp table, let’s spouse a products table exists in my database, then for temp table query is given below
SELECT product_name, list_price
INTO #trek_products — temporary table name
WHERE brand_id = 9 s;
How to create Temp Table in SQL Server
One way to create a temp table in SQL is, using create a table just like a simple table. Example of temp table is given below using create table clause.
CREATE TABLE #temp Table Name (
How to create Temp Table in SQL Developer
How can we make the temporary table data is transient? Firstly, the information is handiest visible within the session which inserts it; any other session will see an empty table. Secondly, the statistics can persist for either a transaction or the session, depending on the ON COMMIT clause; the default is ON COMMIT DELETE ROWS.
CREATE GLOBAL TEMPORARY TABLE temp_Table AS
SELECT * FROM real_Table ;
How to create Temp Table in SQL Procedure
Before creating a temp table we can declare a temporary table like this
The temporary table will be declared as below:
Declare @temp table(
How to create Temp Table in SQL with Example
Below is the complete example of a Temporary table, with parameters or attributes name and data types,
CREATE table # Color (
Colour varchar (10) PRIMARY key
INSERT INTO #color SELECT ‘Red’ UNION SELECT ‘White’
UNION SELECT ‘green’ UNION SELECT ‘Yellow’ UNION SELECT ‘blue’
DROP TABLE #color