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+cNew Test window: ctrl+shift+tPL/SQL developer beautification: ctrl+shift+fRedo: Ctrl+shift+zUndo: Ctrl + ZClear: Ctrl+d (use caution, unrecoverable, I am disabled O (∩_∩) o~)Check all: Ctrl + AIndent: TabCancel indent: Shift+tabUppercase: Ctrl+shift+xLowercase: ctrl+shift+yNote: ctrl+hUncomment: Ctrl+mSearch: Ctrl+fShow Table structure: CTRL + mouse hover over table nameList of templates: Shift+alt+rWindow list: ctrl+w4, TNS Names: Menu Help->suppor
1. Log in to PL/SQL DeveloperThis omits the installation steps for the Oracle database and PL/SQL Developer, and note that when you install the PL/SQL Developer software, do not install it under the program Files (x86) directory o
1. Log in to PL/SQL DeveloperThis omits the installation steps for the Oracle database and PL/SQL Developer, and note that when you install the PL/SQL Developer software, do not install it under the program Files (x86) directory o
The case of PL/SQL programming specification As in SQL, Pl/sql is case-insensitive. Its general guidelines are as follows: Keywords (BEGIN, EXCEPTION, end, IF THEN else,loop, End LOOP), data type (VARCHAR2, number), internal fun
Use of Cursors① Cursor ConceptIn order to handle SQL statements, ORACLE must allocate a region called the context area to process the required information.Contains the number of rows to be processed. A pointer to the representation of the statement that was parsed and the active set of the query (active set).A cursor is a handle (handle) or pointer to a context.with cursors,
The ORACLE tutorial is: Oracle uses PL/SQL to operate COM objects. PL/SQL is a specialized language for programming in Oracle databases. It is a third-generation procedural programming language. Starting from Oracle8, the external C language calling process is provided directly from
Requirements: Query and output employee information for Department 30thMode one: Use Loop...fetch1 SETServeroutput on;2 DECLARE3 CURSORC_emp is 4 SELECT * fromEmpWHEREDeptno= -;5V_emp EMP%RowType; 6 BEGIN7 OPENc_emp;8 Loop9 FetchC_emp intov_emp;Ten Exit whenC_emp%NotFound; OneDbms_output.put_line (v_emp.empno||' '||V_emp.ename||' '||V_emp.job||' '||V_emp.mgr||' '||V_emp.hiredate||' '||V_emp.sal||' '||V_emp.comm||' '||V_emp.deptno); A EndLoop; - Closec_emp; - E
: The establishment log forms a tracking of salary changes. That is to say, if a employee's salary is changed, all corresponding changes should be recorded. If you create a trigger for the salary field of the EMP table to monitor changes to the salary and record each change, this achieves the goal of requirement 3. Create or replace trigger print_salary_change Before delete or insert or update on EMP -- trigger event For each row -- this process must be called for each row modified Decl
We know that there is an overhead for running SQL statements in PL/SQL programs, because SQL statements must be submitted to the SQL engine for processing. The transfer of control between PL/S
data type adopts the unified character encoding equivalent to the varchar2 data type, we should use nchar or nvarchar because multiple character set encoding is supported in the same database. Character encoding supports multiple character sets,A character in al16utf16 occupies three bytes, while UTF-8 encoding occupies two bytes. Nchar and nvarchar are used to unify character encoding for future extension. 5: Relationship between string, varchar, and varcahr2; string, and varchar are subtypes
1. About PL/SQLStands for "Procedural Language extension to SQL"Is Oracle Corporation's standard data access language for relational databasesProdides a block structure for executable units of code2. PL/SQL Block StructureDECLARE (Optional)-Variables, cursors, User-defined conditionsBEGIN (mandatory)-
the department, or if there are multiple employees. So when writing a program, programmers should consider all kinds of possible exceptions, write these exception processing code in the program, such programs can withstand all kinds of wrong test. 2. Predefined exceptions Predefined Exceptions: Oracle defines some common bugs as named exceptions, which are predefined exceptions. "has exception code, exception name, exception message" Oracle has a number
Pl/SQL programming data type in Oracle pl Programming Data Type: www.2cto.com 1. scalar type (scalar) 2. composite 3. reference Type 4.lob( large object) -------------------------------------------------------------- case 1 of defining a scalar. defines a variable-length string v_ename varchar2 (10) 2. define a decimal number
Basic PL/SQL settings 1. How to export table creation statements in batches? Select [Tools]-> [Export User Objects...] from the menu, and select the table to be exported in the window that appears. The SQL script exported in this way does not contain insert statements, that is, the data in the table is not exported at the same time, only DDL statements. 2. How to
V_job EMP. Job%type;BEGIN -Execution SELECT JOB into V_job from EMP WHERE EMPNO = spno; IF v_job = ' President ' Then UPDATE EMP SET sal = sal + EMPNO = spno; elsif v_job = ' MANAGER ' Then UPDATE EMP SET sal = sal + WHERE EMPNO = spno; ELSE UPDATE EMP SET sal = sal + EMPNO = spno; END IF; COMMIT;END;/--Call the stored procedureEXEC Sp_pro6 (7499); Third, circular statement –loopIs the simplest circular statement in PL/
PrefaceBodyPL/SQL(Procedure Language, Procedural Language) SQL 1999 a structured Language commonly used by major database vendors PL/SQL only supports Oracle databasesBasic syntaxMulti-line comment/**/single-line comment --PLSQL BlockStructure[Declare]Define VariablesBeginProcess statement[Exception]Exception HandlingE
Variables and variable typesA variable is an area of memory used to store data, defined in the declare area of a PL/SQL block, when defining a variable, you typically specify a data type for the variable, or you can specify an initial value for the variable when you define the variable.The type of the variable can make any SQL data type or a specific
The features of automatic PLSQL running in ORACLE: In the UNIXDE corn utility, the automatic scheduling task runs in PLSQL in ORACLE. The DBMS_JOB package allows you to schedule PLSQL Features of automatic PL/SQL running in ORACLE: Use the DBMS_JOB package in the UNIXDE corn utility to automatically Schedule Tasks running in ORACLE's PL/
Tags: how to set PL/SQL date display format, PL/SQL date displayJoke: In entering the company for a period of time, will always meet a variety of small problems, but finally still "looking for Niang, ask Google" solutionThe decision. But recently the company introduced a few new recruits, small problems a bunch of,
Tags: style blog ar color sp strong on div logFirst, the control statement1. If statementGrammar:IF PL/SQL and statementsEND IF;Example:DECLARE Number: = n; BEGIN IF > 0 Then dbms_output.put_line (' positive number ') ; END IF ; END;Determine if it is a positive integer!2. If...else ...GrammarIF
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