Oracle

There are many date conversion functions in Oracle, and the common commands are as follows: The To_char () command converts a timestamp to a user-specified date format, such as: SELECT to_char (sysdate, ' Yyyy-mm-dd hh24:mi:ss ') from

Three. Character functions (can be used for literal characters or database columns)1, String interceptSelect substr (' abcdef ', 1,3) from dual2, finding the substring locationSelect InStr (' Abcfdgfdhd ', ' FD ') from dual3, String connectionSelect

---restore content starts---First, error injection(1) User name explosion (for: oracle8,9 and 10g):http://192.168. 2.10 /Ora2.php?name=1' and 1=utl_inaddr.get_host_name ((select User from Dual))-- (2) Fetching information based on error injection

This blog post describes how to silently install oracle11g (11.2.4.0) under a Linux system. Mainly used for graphical display inconvenient scenes, but also for scripted batch deployment needs.System environmentOs:oracle Linux Server Release 6.7The

Requirement: Sort a string that contains numbersAfter search, refer to http://www.cnblogs.com/m-cnblogs/archive/2012/03/30/2425938.htmlScreenshot:(To_number (str,split 1,...) InStr () Replace () substr ())TO_NUMBER(x [, format], [ nls_language

The Oracleoradb11g_home1tnslistener service on the local computer starts and then stops the solution. (My system is win7-installed Oracle 11g)1. Error description: The Oracleoradb11g_home1tnslistener service on the local computer was started and

This question I let me engage in the most of the day, really irritating, words do not say, directly on the codeSELECT * (SELECT COUNT (*) from table_name C where c.bbs_id=t.id) as Plcount,//subquery plcount to sort virtual fieldsFrom table_name t

Select X.ksppinm Name, Y.KSPPSTVL value, y.ksppstdf IsDefault, decode (Bitand (Y.KSPPSTVF, 7), 1, ' MODIFIED ', 4, ' System_mod ', ' false ') Ismod, decode

The vast majority of Oracle database performance problems are due to the unreasonable database design, only a small number of problems rooted in databases buffer, Share Pool, Redo Log buffer and other memory module configuration unreasonable, I/O

Oracle OCM Oracle Certified Master  corresponding Certificate  Oracle Certified Master-OCM (Oracle Certified Master)      Certification Prerequisites  to obtain the OCM certification, OCM certification is required on the basis of the OCP

A synonym is a database object that is an alias defined for a database object , and the primary purpose of using synonyms is to simplify the writing of SQL statements .The concept and type of synonymsSynonyms can be used to define an alias for an

1.sysdate changed to Sysdate (), or Now ();2.NVL (EXPR1,EXPR2) to Ifnull (EXPR1,EXPR2)NVL2 (EXPR1,EXPR2,EXPR3) changed to IF (EXPR1,EXPR2,EXPR3);3.to_date (' 19000101000000 ', ' Yyyymmddhh24miss ') changed to select Str_to_date (' 1900-01-01 00:00:00

The following summarizes two ways, one is auto-generated using Oracle's Sys_guid function, and the other is using sequence,Method One:Select Sys_guid () from dualInsert into T_store (store_id, Store_name, store_price,create_date,end_date)VALUES

1. StringIt is case-sensitive and should be quoted when used.When specifying aliases, quotation marks can be added or not added.When you have spaces or special characters, you must enclose them in quotation marks.When you do not enclose the

Attention:That Oci.dll file is not installed Oracle inside to be downloaded separately that compression package extracted inside theWhich D:\instantclient_11_1\oci.dll in the decompressionInstantclient-basic-win32-11.1.0.6.0.zip Compressed Package

Oracle Multi-Table Association UPDATE statement 2013-12-23 17:15:49Category: OracleFor the sake of convenience, the following simple models are established and some test data are constructed:In a business admissibility subsystem BSS,SQL Code

1. Oracle is a large database and MySQL is a small and medium-sized database, Oracle has a market share of only about 20% 40%,mysql, while MySQL is open source and Oracle is very expensive.2. Oracle supports high concurrency, large traffic, and is

View the size and space usage of an Oracle database(2012-06-19 14:44:30)reproduced Tags: gossip Category: Oracle 1. View the usage status of table spaceSelect Upper (F.tablespace_name) tablespace name,     

Oracle's minus returns data from the first table that is not in the second tableCREATE TABLEhovertree_union_1 (IDINT, ValVARCHAR(Ten) ); CREATE TABLEhovertree_union_2 (IDINT, ValVARCHAR(Ten) ); INSERT intoHovertree_union_1VALUES(1,'A'); INSERT

First, the partition tablePartitioning technology, Oracle allows you to divide a large table into parts, each part called a partition, and then put each part on a different physical disk to improve the performance of the entire database.Each