convert rows to columns in oracle

How to use transform to convert rows and columns; In Oracle, to convert rows and columns, DECODE and CASE statements are commonly used. For simple row and column conversion, DECODE and CASE statements can still cope with it. In scenarios where the

In the development of the report, many times will encounter row and column conversion operations, the developer for the SQL level row and column conversion operation has been not very understanding, today just time to make some simple summary. Here

In oracle, convert columns to the wm_concat function after 10 Gb rows in oracle. Use the test data to create table test (id number, name varchar2 (20); insert into test values (1, 'A'); insert into test values (1, 'B'); insert into test values (1,

Introduction of wmsys Wmssys is used to store all the metadata information for Oracle Workspace Manager. this user was introduced in Oracle9i and (like most Oracle9i supporting accounts) is locked by default. the user account is locked because we

The conversion of rows and columns is often required when writing SQL statements. It may be difficult for a newbie to use the decode and sum functions, this problem can be solved. Create Table Test (name char (10), KM char (10), CJ number) Insert

In Oracle, table columns are changed from VARCHAR2 to CLOB and varchar2clob.Scenario The columns in the original table are defined as the VARCHAR2 type. As we all know, the maximum length of the VARCHAR2 type is 4000. If you want to convert this

Description of pseudo columns and pseudo columns in the SQL Server database. Pseudo columns in SQL Server In the afternoon, someone in the QQ group was discussing (non-clustered) index storage. For clustered index tables, the non-clustered index

V. Index Optimization Design 1. Manage organization Indexes The index can greatly accelerate the database query speed. The index maps the logical value in the table to a safe RowID, so the index can quickly locate the physical address of the data.

SQL optimization should be adjusted from five aspects:1. Remove unnecessary full table scans for large tables2. cache full table scan for small tables3. Verify the use of optimized Indexes4. Verify the optimized Connection Technology5. minimize the

The oracle| program understands the basic but essential processes involved in building a. NET application that uses an Oracle database The downloads covered in this article · Sample code · Oracle Data Provider for. NET (odp.net) With the growing