pl sql examples for practice

nextval will increment the value of sequence once, so if you use multiple nextval in the same statement, the value is different. 3. Modify the sequence alter SEQUENCE You are either the owner of the SEQUENCE or have alter any SEQUENCE permission to change the SEQUENCE. You can alter all SEQUENCE parameters except start to. If you want to change the start value, you must DROP SEQUENCE and recreate the SEQUENCE. Alter SEQUENCEALTER SEQUENCE cux_demo_sequenceINCREMENT by 10MAXVALUE 10000CYCLE--fro

Tag: Type module Lin executes the program-oriented into main fine??Creation and application of Pl-sql package ① Brief IntroductionA package is a combination of related procedures, functions, variables, constants, and cursors, such as PL/SQL programming elements, which have the characteristics of object-oriented program

We know that running SQL statements in a PL/SQL program is expensive because the SQL statement is committed to the SQL engine processingThis control transfer between the Pl/sql engine a

example, my machine is: d:/instantclient_11_2/network/admin4. Set the Oracle language, add the environment variable Nls_lang, and the value is simplified Chinese_china. Zhs16gbkIf you do not know the Oracle language of the remote database, you can ssh or telnet to the remote machine, enter it at the command interface, and connect to the database using the command line.SELECT * from Nls_instance_parameters;View the value of Nls_languageNls_languageNls_territory5. Download and install the PL.SQL.

Tag: Data success ROM cursor AMP employee _id Body whileFirst, the cursor　　1. ConceptA cursor is a handle (handle) or pointer to a context . with cursors, PL/SQL can control the context area and what happens to the context area when the statement is processed.　　2. Cursor Handling　　　　Processing an explicit cursorIt consists of the following four steps:　　　　　　1. Defining cursors cursor cursor_name [ (paramet

The difference between 1:char and VARCHAR2: The varchar2:variable-length becomes longer Char:fixed-length fixed length Allocate memory when char is defined, while varchar2 dynamically allocates memory The following example clearly illustrates the difference between the two: Sql> DECLARE 2 c CHAR (32767): = '; 3 v VARCHAR2 (32767): = '; 4 BEGIN 5 Dbms_output.put_line (' C is [' | | LENGTH (c) | | ']; 6 Dbms_output.put_line (' V is [' | | LENG

; End;For loop implementationDECLARE CURSOR emp_sal_cursor is SelectEmployee_id,salary fromemployees; V_temp Number (4,2); Begin forCinchEmp_sal_cursor Loopifc.salary theThen v_temp:=0.05; elsif c.salary10000Then v_temp:=0.03; elsif c.salary15000Then v_temp:=0.02; Elsev_temp:=0.01; Endif ; Update EmployeesSetsalary=salary* (1+v_temp)whereEmployee_id=c.employee_id; End Loop; End;Cursors with parametersExample: A person who has paid more than 3000 of the 80th departmentDeclare--defines cursor c

Tags: section example input begin arc Declare div pre tputThe modulo (or redundancy) operation of the PL/SQL language does not use the A%B supported by most languages Instead, use the function mod (A, B) Examples are: Write an anonymous block to determine whether a year is a leap, can be 4 but not divisible by 100, or can be divisible by 400 1 Declare 2Judgevarch

Examples show how hackers Execute SQL injection attacks"SQL injection" is an attack method that uses unfiltered/unaudited user input ("cache overflow" is different from this method ), this means that the application should not run the SQL code. If the application creates SQL

. After learning about the above two points, Do you think Chinese Guesses are actually similar to English? Except for the functions used, you must note that the scope of the solution is larger, and the method is similar. High Level After reading the introductory and advanced articles, you can practice a little bit to crack common websites. However, if you cannot guess the table name or the program author filters out some special characters, how can yo

', ') insert into score values (' 0601002 ', ' 006 ', ') inserts into score values (' 0601003 ', ' 006 ', INSERT into score values (' 0601006 ', ' 006 ', and a ') insert into score values (' 0601008 ', ' 006 ', ") insert into score values (' 0601010 ', ' 006 ', ') insert into score values (' 0601001 ', ' 007 ', ' + ') insert into score values (' 0601002 ', ' 007 ', ") insert INTO Score values (' 0601003 ', ' 007 ', up) insert into score values (' 06010(' 008 ', ') insert into score values (' 06

a.o_id=b.o_id "Get view.3.?????? Use a dataset to get o_salary=o_salary+a_salary.4.?????? Write the UPDATE statement "update originsalary set o_salary=" adds the value "where o_id=" gets the value "5.?????? Loop 3 times to complete this function.Another way is to write a stored procedure, which I will not list here.I want you to think about this before learning about cursors, and some examples of batch processing. Some people might say, "Can't the da

intoCangkuValues(10008,'Boxster', -,Ten,1004)--Nothing wrong . if @ @ERROR >0 begin-- Every execution statement is written in order to make the last sentence if there is an error ,--no matter how many statements are executed, the following will not be executed, directly to Tranrollback GotoTranrollback--Tranrollback to the last execution statement End Insert intoCangkuValues(10002,'Aurora',66.50,Ten,1002)--PRIMARY KEY constraint if @ @ERROR>0 GotoTranrollbackInsert intoCangkuValues(1

Today is nothing special learning SQL query statement, personal feeling is too important, so I looked for an example on the Internet to practice their own, the feeling learned a lot, below to share with you the SQL query Statement example operation.First of all, I have built 5 tables, respectively, as follows:(a) Student table STUDENTS:(b) Results table enrolls:(

. Please note: This example and the other examples in this article will only use the DateDiff and DATEADD functions to calculate the date we want. Each example will get the date you want to calculate by calculating the previous time interval and then adding and reducing it. This is the SQL script that calculates the first day of the one month: Select DATEADD (mm, DATEDIFF (Mm,0,getdate ()), 0)

+a_salary.4. Write the UPDATE statement "update originsalary set o_salary=" To add the value "where o_id=" to get the value "5. Cycle 3 times to complete this function.Another way is to write a stored procedure, which I will not list here.I want you to think about this before learning about cursors, and some examples of batch processing. Some people might say, "Can't the database handle data in one row?" Addsalary the data of the table into rows, and