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temporary tables. No user temp table space exists when creating the database. At least one user temporary table space should be created to allow the definition of a declared temporary table. The User
Temporary tables, table variables, and CTE are often used when writing SQL statements. These three have their own advantages in use: 1. Temporary tables: divided into local temporary tables and global temporary tables. 1.1 Local temporar
be used in memory, myisam, merge, or innodb2. Temporary tables do not support mysql cluster (cluster)3. In the same query statement, you can only search for a temporary table once. For example, the following is not availableThe Code is as follows:Mysql> SELECT * FROM temp_table, temp_table AS t2;ERROR 1137: Can't reopen tabl
Label:When working on a very large table, you might occasionally need to run a lot of queries to get a small subset of large amounts of data, instead of running these queries against the entire table, instead of having MySQL find the few records needed each time, selecting the records to a temporary table might be fast
available Mysql> SELECT * FROM temp_table, temp_table AS t2;ERROR 1137: Can't reopen table: 'temp _ table' Mysql bug address: http://bugs.mysql.com/bug.php? Id = 10327If you use different aliases to search for a temporary table multiple times in a storage function, or use different statements in the storage function,
primary key)Insert into # mytemptable values (1) If a local temporary table is created by a stored procedure or is executed by multiple users at the same timeProgramSQL Server must be able to differentiate the tables created by different users. Therefore, SQL Server adds a digital suffix to the table name of each local tem
if exists (SELECT * from tempdb.. sysobjects where id=object_id (' tempdb. #temp ')) drop table #temp Temporary Tables You can create local and global temporary tables. Local temporary tables are visible only in the current session, and global
We believe that you are familiar with the DB2 table modification operation. The following describes some examples of DB2 table modification for your reference. DB2 Modify TableUse the alter table statement to change column attribu
Label:1. Temporary tables are suitable for large data volumes, because temporary tables can be indexed 2. Table variables are suitable for cases where the data is small, and table variables can only create constraints (PRIMARY Key/unique) when defined to indirectly index 3. The temporal
definitions are visible to all sessions B. DML locks are not required for temporary tables. C. You can index temporary tables and create views based on temporary tables. D. The index on the temporary table is also temporary and o
1. in SQL Server, use select object_id ('tempdb .. # temptable') to determine whether a temporary table has been created. (The returned value is an integer. If no value is set, the return value is null) Tempdb is a database that stores temporary tables. Before creating a temporary
example, the following is not availableCopy codeThe Code is AS follows: mysql> SELECT * FROM temp_table, temp_table AS t2;ERROR 1137: Can't reopen table: 'temp _ table' Mysql bug address: http://bugs.mysql.com/bug.php? Id = 10327If you use different aliases to search for a temporary table multiple times in a storage f
Tags: delete save cannot dictionary create pre auto drop otherwiseThe Oracle database can also create temporary tables in addition to saving permanent tables. A temporary table is a nologging that is stored in a temporary table sp
in their usage: Using temporary tables Copy Code code as follows: CREATE TABLE dbo. #News ( news_id int not NULL, Newstitle varchar (100), Newscontent varchar (2000), Newsdatetime datetime ) INSERT into dbo. #News (news_id, Newstitle, Newscontent, Newsdatetime) VALUES (1, ' bluegreen ', ' Austen ', 200801, GETDATE ()) SELECT news_id, Newstitle, newscontent, newsdatetime
; temporary_tables) | Write_create_table_bin_log () Case sqlcom_drop_table: | If (! Lex-> drop_temporary) | Determine whether temporarytable is explicitly written in the statement | Mysql_rm_table () | Mysql_rm_table_part2 () | For (Table-> next_local) | Drop_temporary_table () // find and delete from Thr-> temporarylist | Delete an object table In summary, we can know that the
table: the name of the system temporary table starts # The global temporary table is visible to the entire SQL Server instance, but it is automatically deleted when all sessions accessing it disappear, for example, restarting the database. Create a
Usage: Temporary tables can be used to store related records for complex queries, which improves efficiency andProgramIs similarMy_cursor declare my_cursor cursor scrollFor select field from tablenameTemporary tables are divided into user temporary tables and system temporary tables.Differences between the system temporary
Tags: own options row data ACL storage space Location orientation extent recommendedDB2 supports automatic storage of three table spaces for SMS, DMS, DMS In DB2, a tablespace is a logical layer between a database and a table stored in that database. Table spaces are created in the database, and tables are created in
When table variables use custom types, the type is valid in the current database.When a temporary table uses a custom type, the type is valid in the tempdb database. The following are three examples: -- Test Example 1: create a custom type ssnuse tempdbgoif object_id ('tempdb .. # testtable ') is not null drop
In mysql stored procedures, using a temporary table in the cursor can replace the array effect, mysql cursor Mysql does not support arrays. However, sometimes the data of several tables needs to be combined. In the stored procedure, the results obtained through complicated operations are directly output to the caller, for example, the mysql temporary
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