sql create temp table from query

PL/SQL Developer double-click table name query, pldeveloper Double-click a table. The default value is Expand/Collapse. To Expand/Collapse a table, you need to view the table data quickly. If you write select * from tab, it will

connection time SELECT E.empno,e.ename,d.dname,deptno From EMP E NATURAL JOIN DEPT DUSING (DEPTNO)WHERE DEPTNO = 10; --using to define which column of the same name to use to connect (5) The ON clause is the condition used when generating temporary tables where is the filtering of temporary tables (on and and on where both filter the resulting temporal table) SELECT e.empno,e.ename,d.dname from EMP E join DEPT D

table, and when there is no matching row in one table, the selection list column of the other table contains a null value (NULL) if there is one, all data is displayedSQL syntax:Select *from table1 full join table2 on table1. Condition column name = table2. Condition Column NameInternal connection:Concept: An inner join is a comparison operator that compares the

This article provides three SQL statement instance codes for table creation, one-to-one test, and explains how to use SQL to create data tables and databases. This article provides three SQL statement instance codes for table crea

Label:Transferred from: http://www.cnblogs.com/aflyfly/archive/2011/08/10/2133546.html actinium Fly MS SQL Server1. Query All TablesSelect [ID], [name] from [sysobjects] where [type] = ' u ' ORDER by [name]2. Query all databases3. Select [Name] from [sysdatabases] ORDER by [name]Querying fields in a tableSelect [Name] from [syscolumns] where [name] = ' tablexxx '

/*Normal row and column conversionsLet's say a student score table (TB) is as follows:Name Subject ResultZhang San language 74Zhang San Mathematics 83Zhang San Physics 93John Doe Language 74John Doe Mathematics 84John Doe Physics 94*/-------------------------------------------------------------------------/*Want to becomeName Chinese mathematics Physics---------- ----------- ----------- -----------Lee 474 84 94Sheet 374 83 93*/CreateTable TB(Name varc

withno_logDBCCshrinkdatabase (database name)execsp_dboption \'database name \', \'autoshrink\', \'true\' \\\'Add field General function Sub AddColumn (tablename,columnname,columntype) Conn.execute (\ "Alter Table \" tablename\ "add \" columnname\ "\" columntype\ "\") End Sub \\\'Change the field general function Sub Modcolumn (tablename,columnname,columntype) Conn.Execute(\"Alter Table\"TableName\"Alter C

Label:MS SQL Server 1, querying all tables select [ID], [name] from [sysobjects] where [type] = ' u ' ORDER BY [name] 2, querying all Databases 3, select [Name] F ROM [sysdatabases] ORDER BY [Name] Query table field select [Name] from [syscolumns] where [name] = ' tablexxx ' ORDER by [Colid] Oracle 1. Find all indexes of the