sage erm

:(1) A target column is not a simple attribute name, but a clustering function or column expression, or a target column *(2) several fields with the same column as the view are selected for multi-table join.(3) You need to enable a new and more appropriate name for a column in the view. When RDBMS executes the create view statement, it only saves the VIEW definition to the data dictionary and does not execute the SELECT statement. When querying a view, data is retrieved from the basic table acco

(Sno char (5) not null unique,Sname char (20) unique,Sgender char (1 ),Sage int,Sdept char (15 ),Smoney double); Query:Select * from student; Insert (insert a record each time ):Insert into student values ('20140901', 'sunnyjune', 'M', 23, 'LIFE', 00001 );Insert into student values ('20140901', 'sunnyjuly', 'F', 18, 'LIFE', 00002 );Insert into student values ('20140901', 'sunday', 'F', 20, 'LIFE', 00003 ); Change:Alter table student add stime date;Up

/*Title: 50 SQL statements involved in a project (sorted Version)Author: AI xinjue Luo. Xin Hua)Time: 2010-05-10Location: Chongqing aerospace Vocational CollegeNote: The following 50 statements have been tested according to the test data. It is best to run only one statement at a time.Problem and description:-- 1. Student tableStudent (s #, sname, sage, ssex) -- s # student ID, sname Student name, sage year

-four billion bytes. When it comes to shuodan, zhenlai receives the letter. As the time goes, heaven and earth shall be refined, and every day and month shall be held together. Xiongyang broadcast Xuan Shi, female Yin yellow package. Chaotic phase transition, the foundation of privilege tree. After the nutrition, the gods become bodies. All the people are confused.　　　　[Saint's fourth chapter] Zhong nizan hongmeng, Qian Kun de Dong Xu, Gong Gu dang yuan Huang, Guan Yu was founded at the beginning

Stored Procedure zhuanzhang) 1. execute zhuanzhang 'a, 'B', 50002. execute zhuanzhang 'C', 'D', 5000Note the result changes. Http://blog.csdn.net/cnlht/archive/2007/12/19/1953032.aspxUse CASE structure in queries Use CASE structure to classify query results Example 1:Select zkzh Admission Ticket No., xm name, total score =CaseWhen zcj = 0 then 'failed'When zcj = 1 then 'pass'When zcj = 2 then 'good'When zcj = 3 then 'excellent'Else 'error'EndFrom ncre26 Questions:1. How to classify the grade qu

Select [name], Isnull (sum (case subject When 'China' then result End), 0) as 'China ', Isnull (sum (case subject When 'mate' then result End), 0) as 'mat ', Isnull (sum (case subject When 'physical 'then result End), 0) as 'physical' From student0 Group by [name] Copy codeThe Code is as follows: -- A subquery uses a query statement as a result set for other SQL statements, just like using a common table,-- The query statement used as the result set is called a subquery. Almost all tables that

[name],Isnull (sum (case subjectWhen 'China' then resultEnd), 0) as 'China ',Isnull (sum (case subjectWhen 'mate' then resultEnd), 0) as 'mat ',Isnull (sum (case subjectWhen 'physical 'then resultEnd), 0) as 'physical'From student0Group by [name]Copy codeThe Code is as follows:-- A subquery uses a query statement as a result set for other SQL statements, just like using a common table,-- The query statement used as the result set is called a subquery. Almost all tables that can be used can be r

MySql database data update operation its advanced application bitsCN.com MySql database data update operations on its advanced applications There are three types of data update operations: add data to the table, modify data in the table, and delete data in the table. The data table used for demonstration uses three data tables: student, course, and SC. the specific content of the data table is in the PHP and MySql databases. how to obtain the total number of records for each category Insert da

to understand the simple use of stored procedures, so all the examples are simple.No parameter stored procedure:Select all the information in the student table,Create proc StuprocAS//here cannot be omitted without writingBegin//begin and end are a pair, you cannot write only one, but you can never writeSelect S#,sname,sage,ssex from StudentEndGoThere are parameter stored procedures:Global variablesA global variable, also known as an external variable

SET ANSI_NULLS onGOSET QUOTED_IDENTIFIER ONGOWhen SET QUOTED_IDENTIFIER is on, identifiers can be delimited by double quotation marks, and literals must be separated by single quotation marks. When SET QUOTED_IDENTIFIER is OFF, identifiers are not quoted and must conform to all Transact-SQL identifier rules.The SQL-92 standard requires that the value be FALSE when the null value equals (=) or does not equal (When SET Ansi_nulls is OFF, the Equals (=) and not Equals (No parameter stored procedure

Mt. Wuzhishan Description The Sun Guo in the journey to the Great Heaven, Buddha ancestors came to yield him, said: "I play a game with you, if you have the ability, a loop out of my right hand, count you win, and then do not move Sword bitter war, please the Jade Emperor to live in the West, the Heavenly Palace let you, if you can not play the palm, you also the Nether for the demon, and then a few "The sage