db2 wildcard characters

lesson sixth filtering with wildcard characters6.1 Like operatorThe wildcard itself is actually a character that has special meanings in the WHERE clause of SQL, and SQL supports several wildcard characters. To use wildcard characters in a search

This article mainly describes how to optimize the performance of DB2 application systems. We all know that DB2 database is a high-performance large-scale relational DB2 management system, it is widely used in the customer/server architecture. The

What is a regular expression?Regular expressions are used to find and replace patterns in strings. The regular expression is defined in a certain syntax, and the regular expression engine uses this syntax and compares it to a string. The engine

The name of the student who queried the surname "Liu" and whose full name is 2 characters: SELECT Sname From Student WHERE Sname like ' Liu __ '; Why is there no result? I changed the two lines to a% after the results come out, is it not in the DB2

1, Understand sql1.1 Database Foundation 1.1.1 Database: A container that holds organized data (usually a file or a set of files) (also understood as a collection that is stored in an organized manner)Note: Database software is called DBMS (Database

3.3.5 Create or delete the database directly in the database directory, just create a directory with the same name as the database under the MySQL data directory, and delete the database by deleting the directory. So, you can do this directly,

Golden SQL notes (1) and golden SQL notes Page (1-75) It is recommended that the primary key be meaningless for future extension. PS: assume that the bidding documents are encoded as the primary key, and the associated tables must be modified when

Page (1-75)the primary key is preferably a meaningless field for later expansion.PS: Assuming the tender code as the primary key, after the bid code to fill the wrong time, the related tables need to be changed. If it is a meaningless self-increment

Regular expressions provide a powerful way to work with text. With regular expressions, you can perform complex validation of user input, parse user input and file content, and reformat strings. PHP provides users with a simple way to use POSIX and

3.4 Table TriggersSYMMETRICDS uses database triggers to capture the data to be synchronized. The SYMMETRICDS trigger is defined in the trigger table. SYMMETRICDS generates a database trigger using a single line of records inside. This trigger is