sql declare cursor

Reference article:Http://www.cnblogs.com/knowledgesea/p/3699851.htmlHttp://www.cnblogs.com/moss_tan_jun/archive/2011/11/26/2263988.htmlHttp://www.cnblogs.com/dubing/archive/2011/11/07/2238868.htmlHttp://www.tuicool.com/articles/eAJbEzZThe life cycle of a cursor consists of five stages: declaring a cursor, opening a cursor, reading

Because this cursor is executed it is equivalent to a select its efficiency is not flattering nor doing in-depth research. Copy Code code as follows: The Table1 structure is as follows ID int Name varchar (50) DECLARE @id int DECLARE @name varchar (50) Declare cursor1

The "SQL" Mark written in the implicit cursor. For example, SQL % ROWCOUNT indicates that the implicit cursor has several rows of records. The explicit cursor is customized by the developer, you can also use C1 % ROWCOUNT to indicate the number of rows in the

Original article, reprint must indicate source: http://www.ncloud.hk/%E6%8A%80%E6%9C%AF%E5%88%86%E4%BA%AB/introduce-for-sqlserver-cursor-2/In the previous section, we briefly explained the simple creation of SQL Server cursors, which we will explain in detail on the creation of cursors, and their characteristics, based on the creation of cursor code on MSDN.1 DEC

From http://tshfang.nipei.com/ " How to traverse all records without entering a specific value for each query. Then we use ORACLE cursorCursors are classified into static cursors and referenced cursors (dynamic cursors)Static cursor: The result set defined by the user (implicit cursor and display cursor) remains unchanged.Reference

1 table1 structure as follows2 ID int3 name varchar (50)45 declare @id int6 DECLARE @name varchar (50)7 declare CURSOR1 cursor for--defines a cursor Cursor18 SELECT * FROM Table1-object with cursor (fill in select text as required

The cursor mentioned here is of course the transaction-SQL cursor. Any type of cursor will reduce the performance of SQL Server. However, the reason why the cursor exists is that it is still inevitably used in some situations. Wha

: DECLARE Let me see the effect ()By example, we can see that the cursor has taken the value out of line by line. Then I ask you not to look at the following answer, in the introductory part I just left a question for everyone to try to solve it? Now let's write a stored procedure to solve the problem I just left behind. CREATE PROCEDURE Pk_salaryadd as declare @

, false.% Rowcount returns the number of rows read by the cursor until the current position. 4> example:Set serveroutput on;DeclareVarno varchar2 (20 );Varprice varchar2 (20 );Cursor mycur (vartype number) isSelect emp_no, emp_zc from cus_emp_basicWhere com_no = vartype;BeginIf mycur % isopen = false thenOpen mycur (1, 000627 );End if;Fetch mycur into varno, varprice;While mycur % foundLoopDbms_output.put_l

Label: /*The table1 structure is as follows ID int name varchar (a)*/ Declare @id int Declare @name varchar( -) DeclareCursor1cursor for --Defining Cursors Cursor1 Select * fromTable1--objects using cursors (fill in select text as required) OpenCursor1--Open Cursor Fetch Next fromCursor1 into @id,@name --move the

Create Database book Create Table Booker (Bookno int primary key not null,Bookname varchar (50) not null,Bookprice float not null,Bookcount int not null,Bookwriter varchar (50) not null) Insert into Booker values (1, 'wang Xiaojing ', 'Li Chunchun ')Insert into Booker values (2, 'wang Xiaojing 2', 'Li Chunchun 2 ')Insert into Booker values (3, 'wang Xiaojing 3', 'Li Chunchun 3 ') Select * From Booker------- Global variable ------------------------Select @ version -- view the

Label: Code highlighting produced byActipro codehighlighter (freeware) http://Www.CodeHighlighter.com/--> 1 table1 structure as followsIdintnamevarchar( -) Declare @id int Declare @name varchar( -) DeclareCursor1cursor for --Defining Cursors Cursor1 Select * fromTable1--objects using cursors (fill in select text as required) OpenCursor1--Open Cursor F

Since executing the cursor is equivalent to executing the SELECT statement, the efficiency is not flattering and has not been studied in depth.Copy codeThe Code is as follows:The table1 structure is as follows:Id intName varchar (50)Declare @ id intDeclare @ name varchar (50)Declare cursor1 cursor for -- defines the

Principle of cursor In general, SQL query results are results set of multiple records, while advanced languages can only process one record at a time. The cursor mechanism is used to read and process multiple records at a time. In this way, the operation on the set is converted to the processing of a single record. The procedure for using a

line-oriented program design, which enables the two processing methods to communicate through cursors.1.3 Use of CursorsSpeaking of the advantages of this multi-cursor, we are now going to reveal the mysterious veil of the cursor in person.The order in which cursors are used: reputation cursors, open cursors, read data, close cursors, delete cursors.1.3.1 Declaring cursorsSimplest

A friend once asked me the following question: how to add a new column (regular) in the query results )? For example, the structure and data in the database are as follows: (tablename: People) Name age Changchang 20 Charles 23 Sunny 21 Huangzhs 22 Dazu 65 Now, the query results are displayed as follows using SQL statements: ID name age 1 changchang 20 2 Charles 23 3 sunny 21 4 huangzhs 22 5 Dazu 65 First, analyze this question: (dynamically Add a new

In a project test, we might use batch-generated data to test the program's performance.Here is a question I encountered, because we bulk generated data is almost instantaneous, so the getdate () function is basically the same time, and we ask to generate each data time is different, then how to solve this problem?Search the Internet a lot, here I use the cursor +waitfor to deal with:First of all, the downstream target, because the individual is also u

exhausted the while loop, subqueries, temporal tables, table variables, self-built functions, or other ways to throw to implement certain queries.the life cycle and implementation of T-SQL Midstream targetIn T-SQL, the life cycle of a cursor is made up of 5 parts1. Define a cursorIn T-SQL, defining a

Because SQL server does not provide a method to directly traverse each row of the table, it is only replaced by a cursor and a while loop. The cursor can also be used to traverse tables only using a while loop (this method is available when the ID is int and the primary key is used). However, I have not performed any comparison tests in the two methods, I am not

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