Oracle

Oracle Fetch random Number1. Randomly take records from the tableSELECT * FROM (SELECT * from the staff Order by Dbms_random.random) where RowNum To randomly fetch 3 records from the staff table2. Generate Random NumbersSELECT Dbms_random.         

1. ReplaceReplace (x, y, z) returns a result string that replaces the Y-string in string X with a Z-string.replace (x, y) return value removes the character string x as the Y stringCases:Epacel (' aaabbb ', ' BBB ', ' CCC ')Results: AAACCC2, length

After the Accept agreement, right-click F12, download the zip file with thunder. The following links are detailed steps.http://blog.csdn.net/wanghaiping1993/article/details/52287722Installation steps for

Reasons to write this blog:Often in some operations development technology Exchange Group to see some people ask some questions about Oracle (DBA Novice or the operation of the restoration), but few people answer such questions. Problem:1.1) + How

Turn from: null and empty string ' of Oracle '1. Oracle treats empty string as ' null '2, null and any value do the logical operation of the result is false, including and null itself3. Empty string and null are NULL when judged by IS null4, NULL,

/*merge into detailed introductionThe merge statement is a new syntax for merging the UPDATE and INSERT statements oracle9i.With the merge statement, another table is queried based on the join criteria of one table or subquery,The connection

In the case of C # access to the Oracle database, the Oracle client must be installed, and the same version of the server must be installed, otherwise there will be incompatible issues with various versions, so many times we do not need to install

In an earlier essay, "How Oracle implements a one-stop operation for creating databases, backing up databases, and importing data exports" provides a rough overview of backup and restore operations for Oracle databases, and this article wants to

Pop-up box for error messagesThe contents of the exception:"Oracle.DataAccess.Client.OracleException" type of unhandled exception occurs in DBFSR.dll with additional information: External component has thrown an exception.Catch Exception information:

Operator arithmetic operators: +-*/You can use the Join operator in a SELECT statement: | |    select deptno| | Dname from dept;  comparison operator:> >= =! = Oracle Add Field Syntax: The syntax for adding a field: ALTER TABLE tablename Add (column

1. Deployment Environment Step 1.1 software EnvironmentOperating system:CentOS Release 6.5 (recommended for use with 5.* system)192.168.1.151 Racnode1192.168.1.152 Racnode2Oracle installation package:P10404530_112030_linux-x86-64_1of7.zipP10404530_11

GuideWays to import Excel data into an Oracle database:1. Low efficiency using the features included with the PL SQL toolRefer to this article for an introduction: http://www.2cto.com/database/201212/176777.html2, the use of kettle tools, free,

ADD Combo List/drop down list item element on runtime in Oracle forms.SyntaxPROCEDURE add_list_element(List_name VARCHAR2,List_index, numberList_label VARCHAR2,List_value number);ExampleDeclareNelmntcount number;Begin--First count the total list

Download Source Code Providing an example form for creating hierarchical trees in Oracle Forms to control data Block records. The This form whenever the user selects any node in the tree menu then corresponding the record is displayed at right side.

I. Content and steps(Note that many of the steps here require the students to check the information, understand and digest to complete)1. Database creation(1) installation of oralce11g;(2) Creation of at least two users;(3) Each user to create more

Oracle database, data increment, delete, change, check, through SQL statement implementationSQL: Structured Query language;Features: Case-insensitive, string enclosed in single quotation marks, end of statement end with semicolon;Line comment, add "-

Summarize some experience:1th: Unification.Recently participating projects, their public modules (unit tables, personnel information tables, etc.) all use the surrogate primary key, and the integrated data model uses a logical primary key. In order

1.1.tab_taobao_bill1.1.1 Check whether this table can be redefined online, no error indication can be, error will give the wrong message: exec dbms_redefinition.can_redef_table (' Ycheng ', ' p_ Tab_taobao_bill '); 1.1.2.EXPDP export table for

(a) in the process of using Oracle, we will often encounter some of the errors generated by Oracle, for beginners, these errors may be a little vague, and may not know how to deal with the resulting errors, I use the more frequent error code one by

Oracle's use of the SUBSTR functionGets the string substr (string, start_position, [length]) that specifies the starting position and length in the stringSuch as:SUBSTR (' This was a test ', 6, 2) would return ' is 'SUBSTR (' This was a test ', 6)