if else in oracle sql query

SQL turning is a tool in the Quest Central software produced by Quest Corporation. Quest is an integrated, graphical, Cross-platform database management solution that can manage Oracle, DB2, and SQL Server databases simultaneously. Introduction to

MS SQL Server Query optimization methodThere are many reasons for the slow speed of queries, which are common1, no indexes, or no indexes (this is the most common problem with query slowness, is the flaw in programming)2, I/o throughput is small,

oracle|xml| Conversion In Oracle's 10g 2nd edition, Oracle introduced a full-featured, self-contained XQuery engine integrated with the database that can be used to complete various tasks related to developing XML-enabled applications. XQuery is a

Created: Article attributes: original Article submission: T_Torchidy (jnchaha_at_163.com) Oracle web Environment Injection Technology## BY Jianxin# Http://www.loveshell.net/# Preface I am not a professional database administrator, nor a researcher

Advanced query and difficulties of Oracle and Mysql SQLMysql query Yang Kai exclusive Channel OracleSQL 1. Connection query 1. Internal Connection is used to return all records that meet the connection conditions. By default, if no join operator is

1,OracleOfficial preparations recommended by the company Generally speaking, Oracle has a lot of examination content, and the examination questions are also very detailed, it has a strong requirement on hands-on ability. Therefore, in order to be

Oracle classic Q & A list [common] Oracle classic Q & A list [common] Directories01. What is the initial password after oracle is installed?02. What is the initial Default

1 Introduction to null valuesNULL is a unique data type in the database. If a column in a record is NULL, the value of this column is unknown and uncertain. Since it is unknown, there are several possibilities. Therefore, NULL is not a definite

Here we will introduce more than 40 useful Oracle query statements, covering date operations, server information retrieval, execution status retrieval, database size calculation, and other queries. These are essential skills for all Oracle

Here we will introduce more than 40 useful Oracle query statements, covering date operations, server information retrieval, execution status retrieval, database size calculation, and other queries. These are essential skills for all Oracle