If the query is “long” and you are accessing the results from multiple queries, then a temporary table is the better choice. A view, in general, is just a short-cut for a select statement. If does not imply that the results are ever run and processed. If you use a view, the results will need … Read more
Why it’s not recommended to use subqueries? Database Optimizer (regardless of what database you are using) can not always properly optimize such query (with subqueries). In this case, the problem to the optimizer is to choose the right way to join result sets. There are several algorithms for joining two result sets. The choice of … Read more
You probably want CREATE TABLE AS – also works for TEMPORARY (TEMP) tables: CREATE TEMP TABLE temp1 AS SELECT dataid , register_type , timestamp_localtime , read_value_avg FROM rawdata.egauge WHERE register_type LIKE ‘%gen%’ ORDER BY dataid, timestamp_localtime; This creates a temporary table and copies data into it. A static snapshot of the data, mind you. It’s … Read more
EF doesn’t support importing stored procedures which build result set from: Dynamic queries Temporary tables The reason is that to import the procedure EF must execute it. Such operation can be dangerous because it can trigger some changes in the database. Because of that EF uses special SQL command before it executes the stored procedure: … Read more
Is this what you are after? select * from tempdb..sysobjects –for sql-server 2000 and later versions select * from tempdb.sys.objects –for sql-server 2005 and later versions
select * from tempdb.sys.columns where object_id = object_id(‘tempdb..#mytemptable’);
You are dropping it, then creating it, then trying to create it again by using SELECT INTO. Change to: DROP TABLE #TMPGUARDIAN CREATE TABLE #TMPGUARDIAN( LAST_NAME NVARCHAR(30), FRST_NAME NVARCHAR(30)) INSERT INTO #TMPGUARDIAN SELECT LAST_NAME,FRST_NAME FROM TBL_PEOPLE In MS SQL Server you can create a table without a CREATE TABLE statement by using SELECT INTO
I suppose you could do a subquery with several SELECTs combined with UNIONs. SELECT a, b, c, d FROM ( SELECT 1 AS a, 2 AS b, 3 AS c, 4 AS d UNION ALL SELECT 5 , 6, 7, 8 ) AS temp;
Please note that, in Postgres, the default behaviour for temporary tables is that they are not automatically dropped, and data is persisted on commit. See ON COMMIT. Temporary table are, however, dropped at the end of a database session: Temporary tables are automatically dropped at the end of a session, or optionally at the end … Read more
I wrestled quite a while with the proper syntax for CREATE TEMPORARY TABLE SELECT. Having figured out a few things, I wanted to share the answers with the rest of the community. Basic information about the statement is available at the following MySQL links: CREATE TABLE SELECT and CREATE TABLE. At times it can be … Read more