pl sql sql statement ignored

-- Exception test declarev_ename EMP. empno % type; -- defines the variable beginselect ename into v_ename from EMP where empno = gno; dbms_output.put_line ('name: '| v_ename ); exception when no_data_found then dbms_output.put_line ('unfound'); end ;/ What is PL/SQL?PL/SQL (Procedural Language/

The PL/SQL cursor provides a way for a program to select multiple rows of data from a database and then handle each row separately, providing Oracle with a means to indicate and control the stages of SQL processing. I will think you have a certain understanding of pl/sql. Th

Introduction to PL/SQL Program Design ① PL/SQL program design overview PL/SQL is an advanced database programming language used to access Oracle databases in various environments. Since the language is integrated into the database

At ordinary times, we usually need to write some small PL/SQL programs, triggers, functions, packages, and so on. The following is a small example, where sparrows are kept small and dirty. You can draw a line from each other. Conn HR/hr SQL> Create Table EMP as select * from employees; SQL> Create Table dept as select

example: v_ename: = ' Zhangsan ';DECLAREv_name varchar2 (+);BEGINv_name= ' This is INNER v_name ';outer.v_name= ' This is OUTER v_name ';END;END; 7. Compiling instructionsThe compilation instructions are special instructions issued to the compiler, also known as pseudo-directives, and do not alter the definition of the program. It simply passes information to the compiler, similar to a comment embedded in SQL. use the pragma keyword in

fact there is only one member table and one distributed partitioned view per server. The location of the data is transparent to the application. One, rebuilding the indexDBCCREINDEX,DBCCIndexdefrag, shrinking data and logsDBCCSHRINKDB,DBCCshrinkfile. Set up automatic shrink logging. For large databases do not set up automatic database growth, it can degrade server performance. In T-There is a lot of emphasis on the way SQL is written, and here's a li

statement or PL/SQL block. Set colsep [separator | Off] Determines the column separator (default = ""). Set CON [Cat] [character | on | Off] Determines the character that terminates a substitution variable reference (default = .) Set def [ine] [character | on | Off] Determines the character that starts a substitution variable

Oracle is a large database with a C/SClient/Server structure. It is mainly used in the 4GLSQL language and has the advantages of being powerful, simple, and easy to learn. The working process of the C/S structure is: when the client c end) inputs and sends an SQL statement, it will be sent to the server S end through the network ), the result is analyzed and executed, and then returned to the client through

Tags: oracle plsql cursor Explicit Leng-type cursors  Use of Cursors① Cursor ConceptIn order to handle SQL statements, ORACLE must allocate a region called the context area to process the required information.This includes the number of rows to be processed, a pointer to the representation of the statement being parsed, and the active set of the query.A cursor is a handle (handle) or pointer to a context.

Summary of common SQL statement optimization techniques [classic] and SQL statement techniques classic This example summarizes common SQL statement optimization techniques. We will share this with you for your reference. The detai

Oracle PL/SQL practiceBasic InformationAuthor: (English) bilington (A.) and so on, Lu Tao [Translator's introduction]Press: People's post and telecommunications PressISBN: 9787115294852Mounting time:Published on: February 1, November 2012Start: 16Page number: 166Version: 1-1Category: Computer> database> Oracle For more information, Oracle PL/

Label:A cursor is a private workspace that holds the results of the execution of an SQL statement.When executing an SQL statement, the database server opens a workspace where the results of the SQL statement are saved.There are two forms of cursors in the Oracle database: im

SQL statement optimization introduction and SQL statement Optimization 1. To optimize the query, try to avoid full table scanning. First, consider creating an index on the columns involved in where and order. 2. Try to avoid null value determination on the field in the where clause. When creating a table, NULL is the d

SQL statement join Table query and SQL statement join query Answers to questions about SQL statement join Table query 1. Create two databases: Database A (table a) and database B (table B ). 2. allocate the same account permissi

PL/SQL-related data dictionary and plsql-related dictionary Data Dictionary related to PL/SQLHttp://www.oracle.com/technetwork/issue-archive/2012/12-nov/o62plsql-1851968.html Sometimes, we encounter the following problems during PL/SQL development:1) What database objects d

too_many_rows then Dbms_output.put_line (' Too many lines to output! '); When others then Dbms_output.put_line (' other error! '); Endnon-pre-defined exceptionThe steps are as follows:1. Define the exception condition in the definition section of the PL/SQL block:2. Use the PRAGMA Exception_init statement to associate its defined anomalies with standard ORACLE

increased the possibility of generating more future errors. At the end of this article, "How to keep myth away from code"In this section, I will explain to you how to avoid this situation and make the upgrade easier after the program error is corrected and the function is improved, in this way, we can clear the myth before entering the code. However, let's take a look at some of the most common myths in PL/SQL