sql isnull

server| function Two uses of functions in SQL Server (which can be used in place of cursors) 1. Because the update can not use stored procedures, but to update the table based on some of the fields to be calculated. We often use the method of the cursor, which is implemented using the method of the function. Function section: The following is a reference fragment:CREATE FUNCTION [DBO]. [Fun_gettime] (@TASKPHASEID INT)RETURNS FLOAT asBEGINDECLARE @TASK

1. First talk about the difference between pl/SQL and SQL * plus. For example, it is easy to understand: Pl/SQL-> C ++ LanguageSQL * plus-> Microsoft Visual C ++ 6.0 Compiler Pl/SQL is the language of oracle extended SQL. It includes standard

Label:We do software development, most people are inseparable from dealing with the database, especially the development of ERP, and database dealing with more frequent, storage process is thousands of rows, if the volume of data large, people flow, then I can also guarantee the next period of time the system can still run smoothly? So can the next person be able to understand my stored procedures? Then I combined with the company's usual training and personal work experience and share with you,

Chinese reprinted -- Add SQL Server statements and stored procedures to favorites-- ===================================================== ====================-- List all SQL Server tables, field names, primary keys, types, lengths, decimal places, and other information-- Run the query analyzer to generate a table and export it to excel.-- ======================================

Everything is for performance, everything is for businessFirst, the logical execution order of the query(1) from left_table (3) Join_type join Right_table (2) in Join_condition (4) WHERE where_condition (5) GROUP by group_by_list (6) with {cube | rollup} (7) has having_condition (8) SELECT (9) DISTINCT (one) top_specification select_list (9) ORDER by Order_by_listThe parsing order of standard SQL is:(1) The FROM clause assembles data from different da

After a DML statement is executed, the results of the DML statement are stored in four cursor attributes, which are used to control the program flow or understand the program status. When running DML statements, PL After a DML statement is executed, the results of the DML statement are stored in four cursor attributes, which are used to control the program flow or understand the program status. When running DML statements, PL/ SQL % found,

TBGroup BY name--sql SERVER 2000 Dynamic SQL, refers to the course of more than language, mathematics, physics, this course. (hereinafter)DECLARE @sql varchar (8000)Set @sql = ' Select Name 'Select @sql = @sql + ', max (case cour

Reprint Address: http://blog.csdn.net/dba_huangzj/article/details/8300784#Directory First look at the brief definition of Books Online Grammar Here are a few more useful examples First take a look at how this function is used on MSDN COALESCE function returns a value that is not NULL in a parameter, such as Then take a look at applying the function to pivot. The following statement runs on the AdventureWorks database If you want to reverse the result you

Statement Real-Life SQL statement collection (constantly updated-) Foreword: Here will I encounter the programming practice of the value of the SQL statement down the road, on the one hand to facilitate their own search, on the other hand, also tamping the memory of the impending forgotten. Throughout the process I will keep on updating until I can no longer add, and at the same time, only record the most

ALTER PROCEDURE _tmp@id varchar (a), @PN varchar, @Type intasbegin/**********************************--Features: Multi-conditional query performance _tmp ' K3g8kg6nn94sbbs0 ', ' k7f7ff ', 0************************** ********/PRINT 'number of test data bars 500W' Set NOCOUNT ondeclare @time datetimedeclare @Warring VARCHAR (@Type =1 OR @Type =0) beginset @Warring =char (10) + 'the first way, the direct spelling of SQL statements, there is a

related table, which requires us to write the SQL When you try to make the optimizer use the index. In order for the optimizer to use the index efficiently, it should be noted when writing statements: (1123456789A, do not operate on the indexed fields, but want to do a change, such asSELECT ID from T WHERE num/2=100should read:SELECT ID from T WHERE num=100*2 SELECT ID FROM T WHERE NUM/2=NUM1 如果NUM有索引应改为: SELECT ID FROM T WHERE NUM=NUM1*2 如果NUM1有索引则不

_ 02 ') RETURN ENDENDDECLARE @ new_where1 VARCHAR (1000)DECLARE @ new_where2 VARCHAR (1000)DECLARE @ new_order1 VARCHAR (1000)DECLARE @ new_order2 VARCHAR (1000)DECLARE @ new_order3 VARCHAR (1000)DECLARE @ SQL VARCHAR (8000)DECLARE @ SqlCount NVARCHAR (4000)If isnull (@ where, '') =''BEGINSET @ new_where1 =''SET @ new_where2 = 'where'ENDELSEBEGINSET @ new_where1 = 'where' + @ WHERESET @ new_where2 = 'where

('err _ 02 ') RETURN ENDENDDECLARE @ new_where1 VARCHAR (1000)DECLARE @ new_where2 VARCHAR (1000)DECLARE @ new_order1 VARCHAR (1000)DECLARE @ new_order2 VARCHAR (1000)DECLARE @ new_order3 VARCHAR (1000)DECLARE @ SQL VARCHAR (8000)DECLARE @ SqlCount NVARCHAR (4000)If isnull (@ where, '') =''BEGINSET @ new_where1 =''SET @ new_where2 = 'where'ENDELSEBEGINSET @ new_where1 = 'where' + @ WHERESET @ new_where2 =

, which is not only a Chinese, a mathematical, or an English subject. (Same as below)Declare @ SQL varchar (8000)Set @ SQL = 'select sname'Select @ SQL = @ SQL + ', max (case subject when ''' + Subject + ''' then scores else 0 end) [' + Subject + ']'From (select distinct subject from TB) asSet @

= 'select name'Select @ SQL = @ SQL + ', max (Case course when''' + course + ''' then score else 0 end) [' + course + ']'From (select distinct course from TB) asSet @ SQL = @ SQL + 'from TB group by name'Exec (@ SQL)-- Create @ SQL