temp-tables

问题 We had an issue since a recent update on our database (I made this update, I am guilty here), one of the query used was much slower since then. I tried to modify the query to get faster result, and managed to achieve my goal with temp tables , which is not bad, but I fail to understand why this solution performs better than a CTE based one , which does the same queries. Maybe it has to do that some tables are in a different DB ? Here's the query that performs badly (22 minutes on our hardware

问题 My code currently works something similar to this public void foo (Statement st, String sqlStr, String tempTableName) { String aString = foo(tempTableName); boolean result = st.execute(aString); // creates temp table // Now do something else in another method writeToTT(st, tempTableName); } public void writeToTT(Statement st, String tempTableName) { // Final String name String finalSqlWithTempTableName = foo(tempTableName); st.execute(finalSqlWithTempTableName); } The above works fine.

问题 SQL Server 2005 Database. I have a temporary table with many records, these records are coming from an RSS feed and need to be inserted periodically. Some of the data will change, and some will remain the same. I only need to insert the 'new' records, and eliminate the chance of inserting redundant data resulting in duplicate records. How do I accomplish this? Example, tempTable, BEGIN INSERT INTO myTable ( row1 ,row2 ,row3 ) SELECT row1 ,row2 ,row3 FROM @tempTable END 回答1: One way is a not

问题 I am trying to combine the results of several stored procedures into a single temporary table. The results of the various stored procedures have the same column structure. Essentially, I would like to UNION ALL the results of the various stored procedures. A significant fact: each of the stored procedures creates a temporary table to store its data and the results each returns are based on a select against the temporary table: create proc SP1 as . . <snip> . select * from #tmp -- a temporary

问题 I have a very large table called paypal_ipn_orders . In this table I have 2 important bits of information a row called item_name and a row called sort_num . I want to use certain parameters to pull out records from paypal_ipn_orders and put them into a temporary table called temp_table . I know how to select the records as follows SELECT `item_name`, `sort_num` FROM `paypal_ipn_orders` WHERE `packing_slip_printed` = 0 AND LOWER(`payment_status`) = `completed` AND `address_name` <> '' That

问题 I have a one-time operation I need to perform, and am hoping I can do it with a SQL statement (in LINQPad). I need to grab data from two tables, then insert those vals into another one. Specifically, I need to populate the CustomerCategoryLog table with data for each unique combination of Unit/MemberNo/CustNo from the Customers table, adding the corresponding NewBiz value from the MasterUnitsProjSales table. Pseudo-SQL is something like this: // First, need each unique combination of Unit,

问题 I have a TADOQuery that generates a tempTable if I hard code the "Where parameter, it works fine, but if I use a TADO Parameter the next query doesn't know about the temp table. What am I doing wrong? I wish I could simplify this example but here it is. (SQL Server) CREATE TABLE brFTNode_Children ( pID integer NOT NULL, cID integer NOT NULL, primary key (pID, cID) ); insert into brFTNode_Children values(1,2); insert into brFTNode_Children values(1,3); insert into brFTNode_Children values(3,4)

问题 Compare the following stored procedures: CREATE PROCEDURE testProc1 AS SELECT * INTO #temp FROM information_schema.tables SELECT * FROM #temp GO CREATE PROCEDURE testProc2 AS EXEC('SELECT * INTO #temp FROM information_schema.tables') SELECT * FROM #temp GO Now, if I run testProc1 , it works, and #temp seems to only exist for the duration of that call. However, testProc2 doesn't seem to work at all, since I get an Invalid object name '#temp' error message instead. Why the distinction, and how

问题 what are the main purposes for which temporary tables are used? I want to know the practical and commercial uses of temporary tables in actual softwares working in small and large scale companies. 回答1: In my experience, temporary tables are often used to store intermediate calculations in a complex series of CREATE or UPDATE queries that produce some sort of analysis result. An example might be the creation of summary tables for an OLAP database. Temporary tables are also sometimes used to

问题 I'm trying to perform a series of SQL*Server steps using dapper from C#. One step creates a temp table and populates it. Following steps query data from the temp table. The create/populate seems to run successfully, but the first query from the temp table fails saying: "Invalid object name '#GetPageOfGlobalUsers'." using (SqlConnection connection = DBConnectionProvider.CreateConnection()) { ... misc setup stuff... connection.Execute(@" create table #GetPageOfGlobalUsers(row int, EmailAddress