delete query in db2

The following articles describe how to restore and Delete tables in DB2. In actual operations, the DB2 database stores backups and restores data in historical files, and operations such as loading data and deleting tables. if the database name is sample, you can use the following command to list the records of the table to be deleted:

The DB2 tutorial is: Query DB2 XML data using XQuery. About XQueryXQuery differs from SQL in many key aspects, largely because these two languages are designed for two data models with different characteristics. XML documents contain hierarchies and have an inherent order. The SQL-based database management system supports flat and set-based table data structures

The db2 tutorial is: Query DB2 XML data using XQuery. About XQueryXQuery differs from SQL in many key aspects, largely because these two languages are designed for two data models with different characteristics. XML documents contain hierarchies and have an inherent order. The SQL-based database management system supports flat and set-based table data structures.

Although DB2 's hybrid architecture is quite different from previous versions, it is not difficult to take advantage of its new XML capabilities. If you are already familiar with SQL, you will soon be able to translate this skill into the processing of local XML data stored in DB2. You'll know how to do that with this article. The XML features in DB2 Viper (that

You may not know how to use DB2 to query and create tables. The following describes how to use DB2 to query and create tables. We hope that you can have a better understanding of DB2 queries. db2=>createtablet1(idinteger,name

Hello, everyone, today I met a federated query of two tables between two databases in DB2I know there are dblink in Oracle, but I don't know what to do with the two database federated queries of DB2.I looked for something similar toFor example, two databases: DB1,DB2User namePasswordSELECT * from DB1. User name. password, DB2. Username. password where db1. Nm=

Label:DB2-alter Append/delete/reset column operation 1. Add field ALTER TABLE name add field name type DEMO:1 ALTER TABLE table_name NBSP;ADD N Bsp;column_test VARCHAR (50); 2. Change the field type ALTER TABLE name ALTER COLUMN field name set data type type DEMO: 1 ALTER TABLE table_name ALTER COLU MN column_test Set Data type VARCHAR (3); NOTE: There are operational restrictions for changing the field type. To change the field to a size large

This article mainly describes the actual operation steps for identifying tables and packages that DB2 does not use indexes. If you do not use indexes for DB2, if you are interested in the actual operation steps for tables and packages, you can click to view the following articles. We all know that the LASTUSED column tells you the exact time for the last access to the index in the

The following articles mainly show you how to improve SQL query performance in SAP applications due to DB2 performance optimization, if you are interested in improving SQL query performance in the SAP application of DB2 performance optimization, you can click to view the following articles. SAP provides the following

1. Add a fieldALTER TABLE [table_name] add [column_name] [Column_type]2. Change the field typeALTER TABLE [TABLE_NAME] ALTER COLUMN [COLUMN_NAME] Set data type [Column_type]Note: Changes to the field type are limited, such as changing the field to be larger than the previous type, if you want to change the size or change the decimal length, you must first drop the original column and then add it again.For example, I want to change the column of a varchar (10) to varchar (6) or change the column

,descitem_id,max (content)From DETAILTEMP1GROUP BY catentry_id,descitem_id@SELECT * from TableA where catentry_id to (select distinct catentry_id from TableA GROUP by CATENTRY_ID,DESCITEM_ID has COUNT (*) >1) @ --5. Delete temporary table The code is as follows Copy Code drop table detailtemp1@--end There are several other ways to share 2, DB2

DB2 Materialized View (Materialized Query Tables, MQT), materializedmqt The Materialized View of DB2 MQT is a table defined based on the query results. The data contained in the MQT comes from one or more tables based on the MQT definition, using MQT can significantly improve the q