coalesce statement in sql

SQL Server COALESCE functions detailed Many people know the IsNull function, but few people know the COALESCE function, people will inadvertently use the COALESCE function, and found that it is more powerful than isnull, in fact, so far, this function is indeed very useful, this article mainly explains some of the bas

, the use of offset-fetch to achieve it is a blast. Coalesce Compare to ISNULL In the previous section we talked about string functions, which omitted a string function called COALESCE, which is available on the SQL 2008+, and there are several other similar handles to string functions, which we'll look at together. It is defined by MSDN to evaluate the variabl

the SQL version to 2005, the use of offset-fetch filter filtering, it is based on SQL 2011. The above we take data from 31 to 40, if implemented with Offset-fetch, we can see that the function literally means to know how much data is skipped and how much data to crawl, so we need to skip the previous 30 data, we need to take the next 10 data.Ten 3 * fromsales.customersorder to CustID* @PageSize rowsfetch

Tags: technical SQL function too share span current time fun tar strongHere are a few more useful examples: First, take a look at the use of this function from MSDN, the COALESCE function (hereinafter referred to as the function), and return a non-null value for a parameter. Such as: SELECT COALESCE (null, null, GETDATE ()) Since all two para

], [mileage], [m_year], [M_month], [M_day]) VALUES (2, 40, 2015, 1, 10)INSERT [dbo]. [Cardata] ([Carid], [mileage], [m_year], [M_month], [M_day]) VALUES (2, 45, 2015, 1, 11)INSERT [dbo]. [Cardata] ([Carid], [mileage], [m_year], [M_month], [M_day]) VALUES (3, 50, 2015, 1, 11)ROLLBACK--Use the SQL statement to count the mileage per car (not the total mileage)--Key points: How to get on a record, do you have a

EXCEPT/INTERSECT, CASE/ISNULL/COALESCE in SQL SERVEREXCEPT and INTERSECT General explanation: Compare the results of two queries and return non-repeated values. EXCEPTFrom the left query, all non-repeated values not found in the right query are returned. INTERSECTReturns all non-repeated values in both the left and right queries. The following are the basic rules that combine the result sets of two queries

Common SQL date format conversion methods Posted by Ouyang Zhenhua on 8:46:20 Select CONVERT (varchar (12), getdate (), 101) 09/12/2004 Select CONVERT (varchar (12), getdate (), 103) 12/09/2004 Select CONVERT (varchar (12), getdate (), 104) 12.09.2004 Select CONVERT (varchar (12), getdate (), 105) 12-09- Select CONVERT (varchar (12), getdate (), 106) 12 09 2004 Select CONVERT (varchar (12), getdate (), 107) 09 12,200 4 Select

Tags: code SSI parameter using SQL coalesce otherwise log class nullif function Nullif (expression1,expression2): Given two parameters Expression1 and Expression2, if two parameters are equal, NULL is returned, otherwise the first argument is returned. Equivalent to: case when Expression1=Expression2 then NULL ELSE Expression1. For example, select Nullif (1,1) returns Null,select Nullif (1,2) returns 1. The

(200), Price number);INSERT into Test_table VALUES (1, ', 10);INSERT into Test_table VALUES (2, ' cat1 ', 10);INSERT into Test_table VALUES (3, ' CAT1 ', 3);INSERT into Test_table VALUES (4, ' Cat2 ', 11);INSERT into Test_table VALUES (5, ' cat2 ', 10);INSERT into Test_table VALUES (6, ', 10); COALESCE (CAT, ' unknown '), ResultCOALESCE (CAT, ' UNKNOWN ') SUM (price)Unknown 20CAT1 13Cat2 21Note: Coalesce