Get structure of temp table (like generate sql script) and clear temp table for current instance

Question

How do I get structure of temp table then delete temp table. Is there a sp_helptext for temp tables? Finally is it possible to then delete temp table in same session or query

Answer 1

exec sp_columns table_name;

example

exec sp_columns employees;

Answer 2

To Get structure of temp table

Many of us will use common methods like Keyboard Shortcut – ‘Alt+F1‘ or will use ‘SP_HELPTEXT‘ Command (so many other methods are also there) to view the Structure of Physical Table. As we all know, Viewing the Structure of Temp Table is not as common as Viewing the Structure of Physical Table. we are going to see, how to view the Structure of Temp Table easily in SQL Server. The below mentioning methods are applicable at both Azure SQL DB and On-Premises.

Demo SQL Script

IF OBJECT_ID('TempDB..#TempTable') IS NOT NULL
    DROP TABLE #TempTable;

SELECT 1 AS ID,'Arul' AS Names
INTO
#TempTable;

SELECT * FROM #TempTable;

METHOD 1 – Using SP_HELP

EXEC TempDB..SP_HELP #TempTable;

Note-

In the Table Structure, the Table Name shows something like ‘#TempTable__________________________________________________________________________________________________________0000000004CB’. Actually, the total length of each and every Temp Table name will be 128 . To handle the Same Temp Table name in Multiple Sessions differently, SQL Server will automatically add some underscores in between and alphanumeric’s at end.

METHOD 2 – Using SP_COLUMNS

EXEC TempDB..SP_COLUMNS '#TempTable';

METHOD 3 – Using System Tables like INFORMATION_SCHEMA.COLUMNS, SYS.COLUMNS, SYS.TABLES

SELECT * FROM TempDB.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME IN (
SELECT NAME FROM TempDB.SYS.TABLES WHERE OBJECT_ID=OBJECT_ID('TempDB.dbo.#TempTable')
);
GO

SELECT * FROM TempDB.SYS.COLUMNS WHERE OBJECT_ID=OBJECT_ID('TempDB.dbo.#TempTable');
GO

SELECT * FROM TempDB.SYS.TABLES WHERE OBJECT_ID=OBJECT_ID('TempDB.dbo.#TempTable');
GO

To Clear temp table for current instance

IF OBJECT_ID('TempDB..#TempTable') IS NOT NULL
    DROP TABLE #TempTable;

Answer 3

As long as I know there is no SP_HelpText for tables. Try this:

Select * From tempdb.sys.columns Where object_id=OBJECT_ID('tempdb.dbo.#myTempTable');

Answer 4

So, this helped me. It created the Table columns.

Select Column_Name + ' [' + DATA_TYPE + ']' + 
case when Data_Type in ('numeric', 'varchar', 'char')
    then '(' +
        case
            when DATA_TYPE = 'numeric' then CAST(numeric_precision as varchar(3)) + ',' + CAST(numeric_scale as varchar(3))
            when DATA_TYPE = 'varchar' then CAST(CHARACTER_MAXIMUM_LENGTH as varchar(3))
            when DATA_TYPE = 'char' then CAST(CHARACTER_MAXIMUM_LENGTH as varchar(3))
        end
         + ')'
    else ''
end
+ ','
, * 
From tempdb.INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME LIKE '#MEHTEMPTABLE%'

All I then needed to do was copy these items into a Table Declaration

Declare @MyTable Table
(
--All columns here
)

That would've resolved my issue, but I was pressed for time

Answer 5

I needed to be able to recreate a temp table in a script, so I used this code generate the columns part of the CREATE TABLE statement:

SELECT char(9) + '[' + c.column_name + '] ' + c.data_type 
   + CASE 
        WHEN c.data_type IN ('decimal')
            THEN isnull('(' + convert(varchar, c.numeric_precision) + ', ' + convert(varchar, c.numeric_scale) + ')', '') 
        WHEN c.data_type IN ('varchar', 'nvarchar', 'char', 'nchar')
            THEN isnull('(' 
                + CASE WHEN c.character_maximum_length = -1
                    THEN 'max'
                    ELSE convert(varchar, c.character_maximum_length) 
                  END + ')', '')
        ELSE '' END
   + CASE WHEN c.IS_NULLABLE = 'YES' THEN ' NULL' ELSE '' END
   + ','
FROM tempdb.INFORMATION_SCHEMA.COLUMNS c 
WHERE TABLE_NAME LIKE '#myTempTable%' 
ORDER BY c.ordinal_position

I didn't test for all sql datatypes, but this worked for int, float, datetime, money, and bit.

Also - ApexSQL Complete (free) has a nice feature where you can export grid results into an Insert Into statement. I used this to load this created temp table in my script.

Answer 6

Select * From tempdb.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME LIKE '#yourtemp%'