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Label:Control statements are fundamental to any language, to any programmer. Learn PL/SQL, only to realize the simplicity of Java grammar, it is not an era of things, of course, their positioning is not the same, not in their own longer than the short of others. --The 4th chapter begins--code 4.1 The simplest if statement uses example DECLARE v_count number (10)
PL/SQL script language value assignment statement syntax table and record comply with the type usage, select the statement if else usage anonymous block (1), assign value statement syntax PL/S
Label:You can use the Loop statement to loop through the data in PL/SQL, which allows you to loop through the specified sequence of statements. The common Loop Loop statement consists of 3 types: basic loop, while ... Loop and for ... LOOP. The basic syntax structure of the loop st
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
Tags: style blog color ar for div sp on logFirst, IntroductionLike programming languages, Oracle PL/SQL also has its own process control statements. With Process Control statements, we can implement more complex business logic operations in PL/SQL. Without going to the program to control, to a certain extent, improve t
All along, I always in SQL tools, such as SQL Server, Navicat and so on to execute SQL statements to find the problem of their own written SQL problem, the result is asked, let people laughable!So how do you debug a white-line stored procedure? How do I debug a hundred-line SQL
record variable typeDeclare Type type_record_dept is record ( Deptno Dept.deptno%type, Dname Dept.dname%type, Loc Dept.loc%type ); Temp type_record_dept;Begin Temp.deptno: = 56; Temp.dname: = ' software '; Temp.loc: = ' gz '; Dbms_output.put_line (Temp.deptno | | "| | Temp.dname | | "| | TEMP.LOC);End--Declaring the record variable with RowTypeDeclare Temp Dept%rowtype;Begin Temp.deptno: = 57; Temp.dname: = ' it '; Temp.loc: = ' sz '; Dbms_output.put_line (Temp.de
cannot give the literal value null to EXPRESSION1,2. Coalesce[,k??? ' Les] FunctionsThe COALESCE function compares each expression in the expression list to null and returns the value of the first non-null expression. The COALESCE function has the following structureCOALESCE (Expression1,expression2,........., expressionn)If expression1 equals null, EXPRESSIOIN2 is computed. If the expression2 evaluates to NULL, the function returns EXPRESSION2 and returns null if the result of all expressions
The following is a detailed analysis of the if statement in Oracle PLSQL. For more information, see copy the code below: * If statement: determine the number entered by the user. * Setserveroutputon -- input acceptnumprompt on the receiving keyboard. Enter a number:; declare -- enter the number entered on the screen. The following is a detailed analysis of the if state
Joke: In the first contact with the operation of the work, sometimes see some big God for SQL is handy, beat a full SQL speed let people ignorant. Later his weak weak consult a bit, the original is can fully use the Plsql tool shortcut keys, to improve efficiency. The following is a little summary of my own. Description: in the use of PL/
PL/SQL daily question: the difference between a CASE statement and a CASE expression: there are many different types of guinea pigs in the world, some of which have identifiable characteristics. For example, the "Abyssinians" skin has a pleated garlands www.2cto.com "Texels" with long curly hair. In contrast, the White Crested Guinea Pig on the header contains a
statement, the statement formulated by the reserved word else is executed when the related condition evaluates to NULL.4. ElseIf statementsElseIf structureIF Conditiono 1 ThenSTATEMENT 1;ELSEIF CONDITION 2 ThenSTATEMENT2;ELSEIF CONDITION 3THENSTATEMENT3;....ELSESTATEMENT N;END IF;The reserved word if identifies the ElseIf structure to begin with. Condidtion 1 to Condidtion N is a series of conditions in wh
You can use the Loop statement to loop through the data in PL/SQL, which allows you to loop through the specified sequence of statements. The common Loop Loop statement consists of 3 types: basic loop, while ... Loop and for ... LOOP.The basic syntax structure of the loop statement
You can use the Loop statement to loop through the data in PL/SQL, which allows you to loop through the specified sequence of statements. The common Loop Loop statement consists of 3 types: basic loop, while ... Loop and for ... LOOP.The basic syntax structure of the loop statement
Set the PL/SQL statement shortcut input method to make you a high-efficiency person.1. Open PL/SQL, enter the user and log in2. And open the Tools->preferences->editor->autoreplace-> select Enabled3. Open Editor and enter the following setup
PL/SQL block to display detailed information of the employee with the given employee number 1 SQL> Declare 2 v_empno emp. empno % Type;/* declare the variable v_empno, % type: Make the Type of the variable the same as the empno type in the emp table */ 3 v_emprecord emp % Rowtype;/* declare the variable v_emprecord, % rowtype: Make the variable of the same type a
Label:--1-10--set serveroutput on declare with a while loop to print the numbers- -Define the loop variable to assign an initial value of 1 pnum number: = 1; Begin While pnum --use loop loop to output 1-10 -Note that the loop loop and the while loop are opposite declare pnum number:=1; Begin Loop exit when pnum>10;--exits loop loop when Pnum variable is greater than 10 -output loop variable dbms_output.put_line (pnum) ; --cyclic variable self-increment pnum:
Tags: xxx nbsp. sql quick picture file too big share picture input SQL fileWhen the. sql file is too large for the INSERT statement (the number of INSERT statements is too large), the Execute SQL file is opened directly, and PL +
1. Trigger:Concept:It can be seen as a special process, which is automatically executed and does not allow parameters to be included.The trigger can be used to automatically perform some operations, such as row triggers and data triggers. It is mainly a trigger for Data Control languages.2. transactions:Concept: to ensure data integrity. One or more SQL statements are used to form a logical unit. Then execute the command. In this way, all the results
Use PL/SQL to obtain the statement Create procedure: create or replace procedure created as cursor get_username is select username from dba_users; begin for l_user in get_username loop DBMS_OUTPUT.PUT_LINE ('authorization ('-----------------------'); DBMS_OUTPUT.PUT_LINE ('select (case '); Explain ('when (select count (*)'); DBMS_OUTPUT.PUT_LINE ('from dba_users'
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