oracle sql for dummies

Oracle cold, stay at home and read the "Mastering Oracle SQL" 2nd, found that Oracle's function is still very strong, there are 200 optical functions, hsql is difficult to match. The next stubborn, it seems either to risk using Hibernate3.0 SQL mapping function, or to run the JDBC assembly VO. 1. Report Totals dedicate

both Oracle and SQL Server follow the SQL-92 standard: http://owen.sj.ca.us/rkowen/howto/sql92F.html , but there are some differences, the difference is as follows: Oracle table name, field name, stored procedure name, variable name cannot exceed 30 string lengths. The top syntax is not supported in

This article is purely gossip and basically has no practical value. Oracle always uses SQL _ID to mark a unique SQL statement. SQL _ID corresponds to SQL _TEXT one by one. If the two SQL texts are different, including spaces and o

Oracle learning notes 4 SQL commands (2): SQL operation language category, oracle learning notes SQL is classified into the following language categories1. Data Definition Language (DDL)Create, Alter, Drop 2. Data manipulation language (DML)Insert, Select, Delete, Update 3.

SQL optimization skills (Oracle), SQL optimization skills oracle SQL optimization tips (1): Connection sequence in the Where clause: oracle parses the where clause in order from bottom to top. According to this principle, the conn

How Does oracle obtain the SQL Execution Plan of the client to optimize the SQL statement? Today is September 25,. I continue to learn about SQL optimization and have written two notes on how to obtain the SQL Execution Plan. Although the notes are a bit rough, you can find

Oracle experiences 1 -- oracle introduction @ basic SQL statement @ conditional query @ sort data theory and case studies1. Oracle IntroductionOracle is the first word for English translation of oracle (Oracle bone inscriptions) U

Tags: style io ar using SP for data on art1.string Contact operatorSQL Server use + or contact (SQL Server 2012)In Oracle, you can also use the contact, but can not used + to the contact string, you should use | |;2.oracle date time is different with SQL Server date.SQL Server Date just has a date part, not contains ti

When Oracle database performance problems occur, it is effort-saving to use the Oracle toolkit and give reasonable optimization suggestions. The following two packages are described and their specific practices. The smallest adjustment tool for SQL Tuning Advisor. Use one or more SQL statements as the input content, an

Oracle SQL uses with recursive analysis (for example) and oracle Recursion The WITH recursion provided by Oracle is not just a repetition of tree-like queries. In fact, recursive WITH statements can provide more flexible tree-like Query functions. The following describes the CYCLE statement. This statement not only su

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 SQL tuning for SQL Serve

Label:Free installation of Oracle clients using PL/SQLThe Oracle client is annoying, and deploying a connection to it usually requires the client to install it, and the installer requires the registry to be written on the target machine, assuming you're not a neat freak, you could still be stuck with something like this: when other programs on your machine rely on x64 's

Original posts by QingyunPublished on 2010-6-21 15:44When writing PL/SQL, there is a very important point of attention;Like what:BeginUpdate a SQL Server table @dblink name ...;Update a table for an oracle ...;EndThis PL/SQL execution will error:The error message is:-------------------------------------------

Tags: share development client Analytics admin hint Dev Oracle strConfiguring the Environment Oracle Service SideOracle_winx64_12c_database.iso Oracle ClientInstantclient-basiclite-nt-12.1.0.1.0.zip Integrated development EnvironmentPL/SQL Developer 10.0.5.1710 Configuration steps Make sure that

SQL plus and pl/SQL cannot connect to the remote oracle database, ploracle After the oracle client is installed, SQL plus and pl/SQL may fail to connect to the remote oracle database,

Oracle-based SQL Optimization MethodologyThe ultimate goal of SQL Optimization in Oracle databases is to shorten the execution time of target SQL statements. To achieve the above purpose, we usually have the following three methods to choose from:1. Reduce the resource consu

The following articles mainly talk about Oracle Database Security: PL/SQL injection, I found a good reputation for Oracle database security on a website: PL/SQL Injection information for your sharing. We hope you will have some gains. SQL injection is an old security issue.

For this question, the initial assumption is simpler: replace the keyword and function names that are not the same in the SQL statement, such as To_date in Oracle to convert SQL Server. can be executed on SQL Server. This can be true for some simple SQL statements, but for c

Label:*sql optimization based on ORACLE11GR2 reading notes * Third, cursor in OracleThe cursor in Oracle is a vector of SQL parsing and execution in an Oracle database and is a data structure for C (Oracle is written in C). There are two types of cursor in an

Oracle is not installed, and pl/SQL is directly used to connect to oracle server in 3 minutes. Many people, especially those who do not like oracle, must learn from oracle and think that oracle occupies a lot of memory. I do not l