A global temporary table's name begins with ##. : Temporary Table « Table « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table » Temporary Table 
3. 7. 8. A global temporary table's name begins with ##.
Creating a Global Temporary Table

6>
7CREATE TABLE ##CustomerSales
8(
9>   ID char (6NOT NULL,
10>   Year       smallint NOT NULL,
11>   Sales      money    NOT NULL
12)
13> GO
1>
The global temporary table will be dropped when the session that created it ends and 
when all other processes that reference it have stopped referencing it.
3>
4> drop table ##CustomerSales
5> GO
3. 7. Temporary Table
3. 7. 1. Temporary Tables
3. 7. 2. Local temporary Table
3. 7. 3. Using a Temporary Table to Communicate with an EXEC()
3. 7. 4. A script that creates a global temporary table of random numbers
3. 7. 5. A script that uses a local temporary table instead of a derived table
3. 7. 6. SELECT INTO a temporary table
3. 7. 7. Creating a Table with Duplicate Rows
3. 7. 8. A global temporary table's name begins with ##.
3. 7. 9. Creating a Local Temporary Table with a SELECT INTO
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