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Tags: des io ar sp on c SQL R BSIt is implemented with the conversion function of Oracle encoding, which is feasible after testing.Sql> SELECT *2 from (SELECT ' ABCD ' C1 from dual3 UNION ALL4 SELECT ' AB Test CD ' C1 from dual5 where C1 C1--------AB Test CDConvert function Description:CONVERT (Inputstring,dest_charset,source_charset)InputString: the string to convertDest_charset: Target Character SetSource
SQL statements for Oracle databases use theSCOTT e-r Model DiagramDEPT Department Table EMP Employee table BONUS Bonus Table GRADE salary GradeDEPTNO Department number EMPNO employee number ENAME employee name GRADE salary GradeDname Department name ename employee name Job Job position Losal minimum salaryLOC Department Position job Jobs SAL Payroll hisal most h
rows that the cursor will fetch Declare Type my_cur_type is REF CURSOR; Mycur my_cur_type;--declaring variables which varchar2 (10); Deptrow Dept%rowtype; Emprow Emp%rowtype; Begin Which: = ' Please select dept or EMP '; if (which = ' dept ') then Open Mycur for SELECT * FROM dept; Loop Fetch mycur into Deptrow; Exit when (Mycur%notfound); Dbms_output.put_line (Deptrow.deptno | | " | | | deptrow.d
Tags: style cas double quote Log ACL query table SEL statementExample 1: A) double quotation marks are required for column names that begin with "_" in the Query column. b) Use the "case" keyword to determine whether the pass is directly based on the score. create table Tbl_score (id number (4 ), -- id name" Span style= "COLOR: #0000ff" >varchar2 (30 ), -- name score number3 ), -- fraction otherscore number (3 ) -- other scores ); sel
Tags: sts aof post No original font blog Understanding POS Today encountered a problem, not in the query failed, I thought it was through, carefully checked the information, the original understanding is wrong! Select from temp_a a
where between 1 and -
and not exists (Select*fromwhere a.value=b.value); Then we can find out the results Select from temp_a a
where between 1 and -
and not inch (Select from Temp_b); The result is empty at this time. After Google finally find out why: the
. The most obvious concept in PL/SQL Developer is that you can select a database instance to log in when you log in. This instance can be configured in the \network\admin\tnsnames.ora file. (ii) methods for creating a new DB instance 1 . Through the wizard tools provided by Oracle (recommended) 1) Start the Database Configuration Assistant: All Programs-->oracle
environment variables, it is best to set to the same as the database side, first query the character set information from the database side:Sql> Select Userenv (' language ') Nls_lang from dual;Nls_lang----------------------------------------------------Simplified Chinese_china. Zhs16gbkRight-click My Computer-Properties-advanced-environment variables-system environment variables:1> Select "Path"-click "Edit" to add "D:\Oracle\app\YM\product\instantc
Tags: using com ACL get maximum binding creat arch CharRecently in Oracle-related projects, just contact with Oracle, and SQL Server syntax is still different Sql server: Example: fx+ Current Month day +00001 As shown in the strength of the serial number Principle: First ' FX ' is fixed, getting the current month and
Tags: ref stat cache used and LAN Currval ext ACLIf I were Cristiano Ronaldo . Brief introduction of the simple use method of ORACLE PL/SQL sequence (sequence) Sequence is widely used in Oracle, meaning the serial number, which automatically increases the specified variable, such as 1 or 2 successive increments or more
characters In fact, if the SQL statement is also a WHERE clause, the two tables follow-up will be detailed. Example 9: Querying employee numbers and names for wages greater than $1500 Select Empno,ename from emp where sal > 1500; Example : Query position is not "clerk" employee number and name Select Empno,ename from emp where job Example : Query employee information for payroll from 1500 to 2900 Select Empno,ename from emp where Sal between
In the SQL statement optimization process, we often use hint, and now summarize the use of Oracle hint in the SQL optimization process:
1./*+all_rows*/
It is shown that the cost-based optimization method is chosen for the statement block, and the optimal throughput is achi
statement is only a reference here useless also can not run (Because of the field type of the table)
END; GOInsert into Student (score,name) VALUES (' 1 ', ' m ') How to represent the combination of values and tables in a record set Insert into person (n, num, name) Select Next value for Entity_seq,number,name from Student where number=114;
--next value for Entity_seq sequence and select field combination add
Insert into person (n, num, name) select CAST (as Int.), Number,name from S Tudent whe
How can i use PL/SQL without installing Oracle? Oracle is hundreds of M, and in today's machine configuration, of course, space is not a problem, but sometimes some of the services that are launched have a small performance impact. Use Instantclient bar, no installation, fre
excel|oracle| Data | Database system environment: 1, operating system: Windows Server, machine memory 128M
2. Database: Oracle 8i R2 (8.1.6) for NT Enterprise Edition
3, Installation path: C:\ORACLE
Implementation steps:
1, open Microsoft Excel 20002, file (f) → New (N) → workbook → 3, enter the following data, save as Test.xls, as shown in figure: 4, file (f) →
and stores that data in the record. Note that the fields in the record should match the fields in the query results list. SELECT Studentid,firstname,lastnameInto V_studentinfofrom students where studentid=32;2.3 Using %rowtype It is common practice to declare a record in PL/SQL as a database row of the same type. PL/SQL provides the %rowtype operator, which makes the operation more convenient. For example:
Tags: database 2008R2 obs Soft technology Share right-click String key Error1. Create dblink for Oracle databases in SQL Server as you would for Oracle databasesSecurity is also defined (seemingly no need to follow the access string only need to fill in one)Direct query error, need to change registry add optionkey 1 , rename the newly added item to "OraOLEDB.Orac
Yesterday found in the program data analysis results are not, after the analysis, the original data is still, the value of the field is cumulative. Heart said, not Ah, is to regenerate records before the analysis of AH. Did you forget to delete it? Check the code, found that there are DELETE statements. Then execute in Query Analyzer, error. Try again and again, understand, Delete from does not recognize table name alias! Thinking back, the original program after the main test in
Sql*loader is an Oracle-provided tool for data loading, which is more suitable for business analysis type databases (data warehouses), can handle multiple format flat files, and bulk data loading is more efficient than traditional data insertion
The schematic diagram is as follows:
Control file: A file (the most important file) used to control how data is imported.
Parameter file (optional)
Data files
ORACLE cannot use variables as column names and table names some of the individual validations are:1 DECLARE2Ename1 Emp.ename%TYPE;3TYPE Index_emp_type is TABLE of VARCHAR2( -)INDEX byPls_integer;4 index_emp Index_emp_type;5 BEGIN 6Index_emp (1) := 'E.ename';7 SELECTIndex_emp (1) intoEname1 fromEMP EWHEREE.empno=7369;8 EXECUTEIMMEDIATE'Select' ||Index_emp (1)|| 'From emp e where e.empno=7369' intoename1;
L Use If-then-else logic in SQL statements LL uses two methods: CASE expression: SQL99 syntax, similar to basic, cumbersome decode functions: Oracle's own syntax, Java-like, comparative introduction1Sql> SelectEname,job, Sal, CaseJob when 'President' Then 1.1*Sal2 2 when 'MANAGER' Then 1.2*Sal3 3 when 'Clerk' Then 1.3*Sal4 4
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