oracle sql keywords list

provided in Oracle to execute dynamic SQL, as follows: Copy Code code as follows: Excute immediate Dynamic SQL statement the using-bound parameter list returning into the output parameter list, which is described as follows: 1 dynamic

function greatly improves SQL Execution performance and saves memory usage.Iii. How to improve query efficiency using Oracle statements: 1: Where column in (select * from... where ...); 2 :... where exists (select 'x' from... where ...); the second format is far more efficient than the first one. In Oracle, almost all in operator subqueries can be rewritten to u

much as possible for query, and use less * numbers. Select count (key) from tab where key> 0 superior to select count (*) from tab;When you want to list all columns in the SELECT clause, using dynamic SQL COLUMN reference '*' is a convenient method. unfortunately, this is a very inefficient method. in fact, ORACLE converts '*' into all column names in sequence d

statements with simple statements. They are useful when you need to select rows from a table with data that depends on the table itself. You can put subqueries in many SQL clauses, including: WHERE clause, HAVING clause, FROM clause, CREATE VIEW statement, CREATE TABLE statement, UPDATE statement, Insert statement in the INTO clause and in the SET clause of the Updata statement. A subquery must be placed in parentheses. Place the subquery on the righ

ProceduresA stored procedure in Oracle is called a packages. A package is divided into a packet header and a package body, similar to the class declaration in C ++. The header defines the name and parameters of a stored procedure. Besides the name and parameters, the package body also contains all statements of the stored procedure. Unlike SQL Server, the stored procedures in

option in the Edit list to move to the right.E, System Permissions page check, in the Edit list use "Move All", grant the user all permissions.F, the remaining tab does not need to make any settings, click OK to prompt the user to create success. 3, with Pl\sql to connect Oracle Server, note the use of the 2nd step t

Oracle SQL statement execution sequenceThe SQL syntax is analyzed from right to left.1. SQL statement execution steps:1) analyze the syntax and analyze whether the syntax of the statement complies with the specifications, to measure the meaning of each expression in the statement.2) perform Semantic Analysis to check w

The original address is unknown .... Concepts of Oracle and SQL Server-----------------------------------------------------· Oracle services and databases are equivalent to ms SQL database services;· Oracle services = background processes + related memory· Database = a coll

solve the problem of SQL Server. The Inquirer asked, "Our SQL Server database has become too large-How Does Oracle solve this problem "? Alas... it seems I'm wrong.I want to provide help,...My methods may always be wrong. Maybe I should write a summary to summarize some problems that may be involved. When someone asks me for help, I can give him a

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,

; --Rollback segment statisticsSELECT * from V$pwfile_users; --Privileged User informationSELECT * from V$sqlarea; --The resources and related information accessed by the currently queried SQL statementSELECT * from V$sql; --basic information about the same as V$sqlareaSELECT * from V$sysstat; --Database System state information --the more commonly used view at the beginning of a session isSELECT * from Ses

Oracle to execute dynamic SQL with the following syntax: http://www.cnblogs.com/gaolonglong/archive/2011/05/31/2064790.html Excute immediate Dynamic SQL statement using-bound parameter list returning into output parameter list; This statement is described as follows: 1) Dyn

. STATISTIC # AND s. NAME = 'redo size'; -- transaction startINSERT INTO t1SELECT * FROM All_Objects; -- other dml statementCOMMIT; end_time: = dbms_utility.get_time; select value into end_redo_size FROM v $ mystat m, v $ statname sWHERE m. STATISTIC # = s. STATISTIC # AND s. NAME = 'redo size'; dbms_output.put_line ('escape Time: '| to_char (end_time-start_time) | 'centiseconds'); dbms_output.put_line ('redo size: '| to_char (end_redo_size-start_redo_size) | 'bytes '); END;[Q] how to create a t

dynamic SQL compilation, but also mastered its basic development ideas. Since dynamic SQL is an "indeterminate" SQL, its execution has its corresponding characteristics. The Execute immediate statement is provided in Oracle to execute dynamic SQL with the following syntax:C

Time of the database.SQL id: ID of the SQL statement. Click it to navigate to the SQL details list below. Click IE to return to the current SQL ID.SQL Module: shows how the SQL statement is connected to the database for execution. If the

Introduction to Oracle PL/SQL I. Objective of PL/SQL Structured Query Language (SQL) is a common language used to access relational databases. It is a fourth-generation language (4gl) and its execution features are non-procedural, that is, you do not need to specify the specific method and method of execution, but s

. SHARABLE_MEM,A. PERSISTENT_MEM,A. RUNTIME_MEM,A. parse_cils,A. DISK_READS,A. DIRECT_WRITES,A. CONCURRENCY_WAIT_TIME,A. USER_IO_WAIT_TIMEFrom SYS. V _ $ SQLAREAWHERE PARSING_SCHEMA_NAME = 'chea _ FILL '-- tablespaceOrder by a. CPU_TIME desc Reference: http://jenniferok.iteye.com/blog/700985 Query the most resource-consuming query from V $ SQLAREA Select B. username, a. disk_reads reads,A.exe cutions exec, a. disk_reads/decode(a.executions,, a.exe cutions) rds_exec_ratio,A.

'create synonym' | TNAME | 'for username. '| TNAME |'; 'FROM TAB; Command list: Assume that the currently executed command is: select * from tab; (A) ppend: add text to the end of the current row in the buffer. Result: select * from tab order by tname; (Note: a is followed by two spaces) (C) hange/old/new replace the old text with the new text in the current row c/*/tname result: select tname from tab; (C) hange/text: delete text from the current row

FinlandPst PDT Pacific Standard TimeYst ydt Yukon Standard Time Character functions supported by Oracle and Their Microsoft SQL Server equivalent functions: Functions: Oracle Microsoft SQL ServerConvert characters to ASCIIConcat (expression + expression)Convert ASCII to CHR charReturns the start character (from the le

Oracle SQL * Loader Features analysis Features: SQL * Loader loads data from external files into tables of an Oracle database. it has a powerful data parsing engine that puts little limitation on the format of the data in the datafile. you can use SQL * Loader to do the foll