case exists oracle

Source of the blog post (exists and not EXISTS usage in Oracle): http://chenshuai365-163-com.iteye.com/blog/1003247Bowen Source (in VS. exists statement efficiency issues): http://www.cnblogs.com/iceword/archive/2011/02/15/1955337.htmlAexists (SQL

In is the appearance and the inner table as a hash connection, and exists is the external loop loop, each loop loop and then query the internal table.NOT exists: Do NL, subquery first, there is a virtual table, there is a definite value, so even if

Oracle basic concepts and comparison with informix I. ConceptsUser: informix directly uses the user management system of the operating system. Generally, root and informix are used as super operators to manage other users. Oracle has its own user

Oracle 1, uncompress and unpack downloaded files One step procedure (uses less disk spaces and is faster): Zcat lnx_920_disk1.cpio.gz | Cpio-idmv Zcat lnx_920_disk2.cpio.gz | Cpio-idmv Zcat lnx_920_disk3.cpio.gz | Cpio-idmv Two Step procedure:

ORA-00604 error occurred at recursive SQL level string Cause: An error occurred while processing a recursive SQL statement (a statement applying to internal dictionary tables ). Action: If the situation described in the next error on the stack can

  Exists indicates that the results returned by the subquery statement in () are not null, indicating that the where condition is true, the primary SQL statement is executed. If it is null, the where condition is invalid, and the SQL statement is

The racle database system is a complex software system. Without understanding its internal structure principles and relationships, it is impossible to design and Compile High-Quality application software systems or manage a complex application

Install Oracle 11g in CentOS 6.5 I recently started to learn how to use CentOS and make some records. References: Install Oracle 11g in Cent OS 6_5 (x86_64) I. Hardware requirements 1. Memory & swap Minimum: 1 GB of RAMRecommended: 2 GB of RAM or

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

Note: The following content is suitable for beginners of Oracle Development or Java developers, the master skippedA exists&inThe following three statement functions are from the IODSO.QOS_HISENTRY_SHEET_JTEXT_TD inside find sheet_no in the IODSO.QOS_