dynamic sql in oracle

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Oracle SQL Training Tutorial: Learn Oracle SQL and Web Rapid Application development in practice-book notes

"annual Salary"From EMP ORDER by 3 DESC;SELECT ename,job,sal from emp ORDER by Job,sal DESC;SELECT ename,job,sal from emp ORDER by Empno;Modify Default display widthSET line[size] {80|n}SET Line 100L display the SQL statement in the buffer you just enteredN Text modified section of error'/' (run) commandSAVEGET@ or Start command when the specified script file contents are loaded into the SQL buffer to runS

Actual solutions for Oracle MySQL dynamic tables

,guid,ip,date)values('; set@value1=eid; set@value2=guid; set@value3=ip; set@value4='now())'; set@sql_text:=concat(@temp1,@table,@temp2,@value1,',',@value2,',',@value3,',',@value4); preparestmtfrom@sql_text; executestmt; end; In doing so, it will certainly have an impact on the performance, and it is only temporary ,,, Appendix: MYSQL stored procedures use dynamic SQL to create mul

Collect query optimization data using the dynamic performance view of Oracle

For some current releases, three dynamic performance views are available for DBAs (Database Administrator, Database Administrator) and developers, namely V $ SQL, V $ SQLAREA, and V $ SQLTEXT.These views can be used to collect statistics about SQL command execution. In Oracle 10g and Release 2, the fourth

Oracle data analysis and dynamic sampling

execution plan is calculated with accurate data. The second example shows a more accurate execution plan than dynamic sampling after a table analysis Dynamic sampling: As the name implies is the Oracle Automatic for you preliminary data analysis, because it is random on the table to take some data, so it is not guaranteed that the implementation plan is very a

Oracle Stored Procedure debugging and Pl/SQL installation in 64-bit operating system (prompt that Oracle has been installed before pl/SQL installation)

Today, I am working on an OA report. I use a stored procedure to calculate some data. When doing a for xxx in xxxx loop end loop; loop, I never knew it was Mao. I can't catch the no_data_found exception in for any more. Once this no_data_found Oracle occurs, it automatically jumps out of the for loop, but I don't know what went wrong, that was depressing for an hour. Shit. Later I remembered that pl/SQL too

Oracle Stored Procedure debugging and PL/SQL installation in 64-bit operating system (prompt that Oracle has been installed before PL/SQL installation)

Today, I am working on an OA report. I use a stored procedure to calculate some data. When doing a for XXX in xxxx loop end loop; loop, I never knew it was Mao. I cannot catch the no_data_found exception in for any more. Once this no_data_found occurs Oracle will automatically Jump Out Of The for loop, but I don't know where the error occurred. It was a depressing hour. Shit. Later I remembered that PL/SQL

Flexibility in extending SQL-static t_sql and dynamic SQL

In fact, I think this blog written in Web-based application development is the best, because currently we rarely implement sorting and filtering on the client, and many of the development uses a lightweight two-tier model, so the lack of specialized processing data buffering and filtering business, some people will say, Can we create stored procedures or nested complex control flow blocks? But I want to say that these solutions can only solve part of the problem, but they bring a lot more proble

SQL Server T-SQL and Oracle PL/SQL

T-SQL is an enhanced SQL language provided by SQLServer based on the SQL language. The T-SQL provides all the features of ANSISQL and adds more features such as extended functions, system pre-storage, and program design structures. The following describes 3. the T-SQL of

MyBatis's Dynamic SQL explanation

Label:Home Information Essence Forum FAQ Blog Column Groupmore▼You are not logged in yet! Sign up to learn and keep up Blog Weibo Album Collection Message About Me MyBatis's Dynamic SQL explanationBlog Category: MyBatis MyBatis Dynamic SqldynamicforeachThe Basics section can look at one of my other blogs: http://ha

Azure SQL Database (masking) Azure SQL database Dynamic Data mask

Tags: admin logs pass description China SSM images identity withWindows Azure Platform Family of articles Catalog   When we use relational data, we sometimes want to: -Admin admin, can view all the data -Regular users, some sensitive fields, such as credit cards, e-mails and other fields are masked In this case, you can use Dynamic Data masking to mask some fields of the data table. For example, we have the user's credit card information, email addr

Oracle learning notes 3 SQL commands, oracle learning notes SQL

Oracle learning notes 3 SQL commands, oracle learning notes SQLSQL introduction SQL supports the following types of commands: 1. data Definition Language (DDL) 2. data manipulation language (DML) 3. transaction Control Language (TCL) 4. the Data Control Language (DCL) is a detailed note of the four

Oracle tuning uses related SQL, oracle tuning related SQL

Oracle tuning uses related SQL, oracle tuning related SQL Select * from v $ session where username is not null;Select username, count (username) from v $ session where username is not null group by username;Select count (*) from v $ process;Select value from v $ parameter where name = 'processs ';Select count (*) from

Manage frequently used data dictionaries and dynamic performance views in Oracle

Manage common Oracle data dictionaries and dynamic performance views 1.v$ version query database version information [sql] select * from v$version; [html] BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Producti

Important v $ dynamic performance views, system views, and tables in Oracle

. V $ SQL: executed SQL statement. V $ lock: What kind of locks are occupied by those sessions, what kind of locks are applied for, and whether the session is blocked by other sessions. Which objects are locked by V $ locked_object. V $ session_wait: Select * from V $ session_wait where wait_class! = 'Idle': Check the currently waiting session, such as the blocked session. V $ session_wait_history: the hist

The relationship between Oracle Dynamic view v$,v_$,gv$,gv_$ and x$

Preface: In the process of Oracle operations, often use some dynamic views beginning with v$, such as v$session, once saw someone with v_$session, think someone else wrote wrong, didn't think Desc v_$session can see and v$ Session of the structure, and then found in the beginning of the gv$ view and so on. The opportunity to mount Oracle on a Linux system finally

Use of "ORACLE" Plsql Dynamic Cursors (11g)

: Close REF CURSOR name; Sql> declare 2 type emp_cursor is REF CURSOR; 3 my_cursor emp_cursor; 4 v_ename emp.ename%type; 5 v_ Sal Emp.sal%type; 6 V_deptno Dept.deptno%type: = p_deptno; 7 V_dname Dept.dname%type; 8 begin 9 Select Dname to V_dname from dept where deptno = V_deptno; Dbms_output.put_line (' Department: ' || V_dname); One open my_cursor for the ename, Sal from emp where deptno = V_deptno; Loop Fetch my_cursor Exit when My_c

Use of dbms_ SQL in oracle, oracledbms_ SQL

Use of dbms_ SQL in oracle, oracledbms_ SQL 1. Run the query using dbms_ SQL Use dbms_ SQL to execute the select statement in the order of open cursor --> parse --> define column --> execute --> fetch rows --> close cursor; 1. Create a team table structure, as shown in: Pro

A detailed view of Oracle's common dynamic performance

First look at when to use dynamic performance view: (1) Nomount When you start the routine, Oracle opens the parameter file, assigns the SGA, and starts the background process. Therefore, when the routine is in the Nomount state, only access to the dynamic performance view of the information obtained from the SGA is accessible. (2) MOUNT When installed in a d

Dynamic SQL-reprint Learning

Dynamic SQL Bad:1. dynamic SQL is very dangerous, because dynamic SQL generally constructs your entire SQL statement based on user input, that is, we usually see some parameters involv

MyBatis's dynamic SQL

=" 148. PNG "alt=" Wkiom1k0ebuh5supaacsebqj1pu635.png "/>Report:1, MyBatis in the two built-in parameters:_parameter: Represents the entire parameterSingle parameter: _parameter is this parameterMultiple parameters: The parameters are encapsulated in a map: The _parameter represents the map._databaseid: If the Databaseidprovider tag is configured, _databaseid is the alias Oracle representing the current database.2. Extract reusable

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