pl sql examples for practice

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

In the software development process, programmers often encounter string splicing and splitting work.Take Java development as an example:The foreground passes in a string concatenation of a JSON data, such as: "1001,1002,1003", which may represent a set of ordinal numbers.Programmers need to turn the serial number to the name and output it in the same format, such as: "Zhang San, John Doe, Harry".The common practice of Java programmers is to split the

. SALARY); end;/VII, compound type--PL/SQL table is equivalent to an array in a high-level language, but it is important to note that the subscript of an array in a high-level language cannot be negative, and PL/SQL is negative, and the subscript of the table element is not limited.

Sometimes, we may find that some functions are difficult to complete through PL/SQL, while programming through C/C ++ is much easier. Therefore,OracleProvides the ability to directly call external functions (including C functions or Java methods) in PL/SQL programs, thus extending the

| | ' Wages: ' | | Sp_record. SALARY);END;/ Seven, compound type--pl/sql tableis equivalent to an array in a high-level language, but it is important to note that the subscript of an array in a high-level language cannot be negative, and PL/SQL can be negative, and there is no limit to the subscript of the table ele

PL/SQL learning gift 1 Bulk_Collect call method collection, plbulk_collect All examples in this article are derived from Chapter 6 of the ebook "Expert pl SQL Practices. Xiao Chen thinks that it may be used in the future in the process of learning PLSQL. Take notes here. The

Label:In advance, all examples in this article are based on the sixth chapter of the ebook "Expert PL SQL practices". Xiao Chen felt that in the course of learning plsql, may be used in the future, in this note. The text reads as follows: First prepare the basic Data Bar HARDWARE table. Table structure: Then insert 1,000,000 data Bar. It has to be said, Plsql i

Here, I learned a very important thing is to use PL/SQL developer to see the execution plan of a SELECT statement, the execution plan can see the cost of this SELECT statement,I/O operation cost and other values, You can clearly see the execution efficiency of each part of the statement. When this select statement is selected, press F5 to do so. Take the following SELECT statement as an example:Take the da

/cn/software/tech/oci/instantclient/index.htmlInclude the following:Instant client Package-basic runs OCI, OCCI, and jdbc-oci all files required by the application.Instant client Package-basic Lite: contains only English error messages and supports Unicode, ASCII, and Western European character sets only.The Instant client package-jdbc Supplement adds Xa, internationalization, and rowset to JDBC.Instant Client package-sql *plus contains sqlplus and re

The PL/SQL package is a group of logically related PL/SQL types, variables, and subroutine pattern objects.The package will have two mandatory sections:1. Definition of packaging specification2. Package body or definitionI. Definition OF PACKAGING specificationA specification is an interface to a package. It simply dec

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.Developer configuration appConfigure Tools->preferences->connectionOra

In PLSQL, The UTL_FILE package provides the interaction between input and output of text files. That is to say, we can use this package to achieve file read input or In PL/SQL, The UTL_FILE package provides the interaction between input and output of text files. That is to say, we can use this package to achieve file read input or In PL/

1. Super Long Pl/sql Code Impact: maintainability, performance Symptoms: In complex enterprise applications, there are hundreds of thousands of rows of stored procedures or tens of thousands of rows of packets. Why is the worst: Too long pl/sql code is not good for reading, and third-party tools can cause code-lin

data, so familiarity with SQL is the basis for PL/C programming. The classification of the SQL language is roughly as follows:1) Data Definition language (DDL): Create,drop,grant,revoke, ...2) Data Manipulation language (DML): Update,insert,delete, ...3) Data Control Language (DCL): Commit,rollback,savapoint, ...4) Other: Alter system,connect,allocate, ...The sp

, formatting, and replacement of values, and you can use them to find adjacent values. The following example shows how to use the REGEP_SUBSTR function to find any repeated alphanumeric values separated by spaces. The displayed result is a substring that identifies the duplicate word is.SELECT REGEXP_SUBSTR ('The final test is The implementation ','([[: Alnum:] +) ([[: space:] +) \ 1') AS substrFROM dual SUBSTR------Is Matching Parameter optionsYou may have noticed that regular expression operat

Tags: PL/sql1. Variables and ConstantsVariable syntax: variable_name data_type [[Not NULL] [: =value]Description: NOT NULL defines a non-null constraint on a variable, a variable must be assigned a non-null initial value, and its value is not allowed to be modified to null at any time.--Examples of variables:Sql>serverout onsql>declare v_num Number (4);BEGIN v_num:=20; Dbms_output. The value of put_line ('

consumption of 500 mb of PGA memory, in addition to the memory allocated to the SGA. Fortunately, PL/SQL makes it easy for developers to control the amount of memory used in a bulk collect operation by using the limit clause. Suppose I need to retrieve all the rows from the employees table and then perform some compensation Analysis on each row. I can use Bulk collect as follows: PROCEDURE process_all_row

the subquery, if the subquery is empty, then nothing will be inserted.4, the climax is coming--after removing the where in the subquery, that is, the select condition is definitely a value, it actually inserts all the records in Table E. Ah, fortunately the test library, the amount of data is small, but also executed 5s. Well, that's unusual. Delete all! Depending on the result set insert or need to be cautious ah, otherwise how much garbage data in practic