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This article will walk you through how to create a temporary table in SQL server as effectively as possible. Let’s learn more!
What Is A Temporary Table In SQL Server?
So, what is a temporary table? This is a database table which resides just momentarily on the database server. That way, it temporarily stores a portion of the data of a regular table inside it.
The likelihood of temporary tables becoming permanent tables is actually quite considerable.
A temporary table is created in TempDB and is immediately destroyed when the last connection closes. We can save and process interim findings with the use of temporary tables.
As such, when we need to store transient data, temporary tables come in extremely handy.
Temporary Table: Category
Global Temporary Table
Global Temporary Tables are dropped once the last connection relating the table is not anymore opened and are accessible to all connections.
In particular, a unique table name must exist so that the global table can be built up successfully. The Table Name won’t have any random numbers appended to the end of it.
Local Temporary Table
As for the local temporary table, only the session that generated this kind has access to it. When the connection that produced it is ended, the object is automatically discarded (removed).
How To Create A Temporary Table In SQL Server?
Method #1: Utilizing An INTO Command In A SELECT Query
Utilizing an INTO command in a SELECT query is the easiest method for generating a temporary table. Let’s make this kind of table with the ages, names, and genders of all the students that are male records from the student table.
USE schooldb; SELECT name, age, gender INTO #MaleStudents FROM student WHERE gender = 'Male'
Have a glance at the aforementioned question. You’ll see the age, gender, and name of each entry for a male student from the student table are stored in the “#MaleStudents” temporary table that was established in this place.
After getting done with the SELECT command, the INTO statement is then of benefit to generate a temporary table. Note that a temporary table’s name must begin with a (#).
Next, head toward “Object Explorer -> Databases -> System Databases -> tempdb -> Temporary Tables” to see this table’s location. Side by side with the identification, you will behold the name of your temporary table.
The same connection that produced the temporary table can be used to conduct actions on it. Since then, you can implement query in the same query window which generated the “#MaleStudents” table.
SELECT * FROM #MaleStudents
Because of so, every male student’s age, gender, and name are listed in the #MaleStudents table. The results of the aforementioned search are as follows.
(table id: 15)
What if you want to establish a new connection? Simply launch a new query window in “SQL Server Management Studio” and that’s how you get the task work wonders.
Method #2: Using The Regular Tables Creating Function
The next approach is comparable to making regular tables. Let’s check out the coding below. Once more, a temporary table for #MaleStudents will be created. Keep in mind that a fresh connection must be used to conduct this query.
USE schooldb; CREATE TABLE #MaleStudents ( name VARCHAR(50), age int, gender VARCHAR (50) ) INSERT INTO #MaleStudents SELECT name, age, gender FROM student WHERE gender = 'Male'
Then, in case you run the aforementioned query, you ought to see two temporary tables called “Male Students” inside the tempdb, each with a separate unique identity. This is due to the fact that two distinct connections each produced one of these tables.
Above are neatly all that you should know regarding how to create a temporary table in SQL Server. Hopefully, this post can be a great help to your coding. See then!