定位决定地位,格局决定结局; 脑袋决定口袋,想法决定活法; 思路决定出路,观念决定信念; 心态决定姿态,细节决定成败; 性格决定命运,习惯决定未来. 点这去看我的吉他博客 Table Variable vs. Temp Table Summary
Step 1. To create a table variable, the appropriate syntax involves using the DECLARE statement in conjunction with the TABLE. Syntax for Declaring a Table Variable. DECLARE @TableName TABLE ( Column1 DataType PRIMARY KEY, -- Primary key example Column2 DataType, Column3 DataType );...
15. Unlike a #temp table, you cannot drop a table variable when it is no longer necessary—you just need to let it go out of scope. 16. You can’t build the table variable inside dynamic SQL. This is because the rest of the script knows nothing about the temporary objects created wi...
Temp table Vs. Table Variable ComparisonTransactionTemp tables support transactions. As in the preceding image, I created a temp table then I began my transaction and inserted some records in it and after insertion I rolled back my transaction and later I tried selecting the records and here we...
large data transfers. This is another +1 for the #temp table. [cc lang=”sql”] /*** * TEST 1: @Table Variable Parallelism ***/ DECLARE @SalesOrder TABLE ( [SalesOrderID] [int, [SalesOrderDetail] [int] ) INSERT INTO @SalesOrderDetail ( [SalesOrderID], [SalesOrder...
There are plenty of posts out there talking about the differences and disadvantages/advantages of using table variable vs temp table in a T-SQL query. The one thing I wanted to illustrate here is the difference on how they behave when a transaction rollback is involved. In short, transaction...
A summarization of table variable vs. temp table is attached in the appendix. Instead of repeating those well known facts, I'll focus on several differences that are hardly mentioned so far between table variable and temp table definitions. ...
To create a global SQL temp table, you simply use two pound symbols in front of the table name. Example: ##Global_Table_Name. Table Variables Table variables are created like any other variable, using the DECLARE statement. Many believe that table variables exist only in memory, but that ...
Following are scenarios where temp table/variable are not cached: 1. select into #t 2. alter table #t 3. create index on #t 4. Global temp tables (##t) 5. Local temp tables on adhoc level (nest level 0) 6. table variables are also...
You say "Under memory pressure, the pages belonging to a table variable can be pushed out to tempdb". I often see that quoted as implying that there is still some memory benefit to table variables vs #temp tables however as far as I can tell the pages belonging to a table...