动态SQL在sql server Procedure中的应用 CreatePROCEDURE[dbo].[Proc_Get_Serial_No] ( @Table_Namevarchar(20), @No_Filevarchar(20) ) AS Declare@Serial_Noint Begin Declare@Sqlnvarchar(max) Set@Sql='select @Serial_No= isnull(Max('+@No_File+'),0)+1 From '+@Table_Name+'' Executesp_exec...
COALESCE is one of the tools you have in SQL Server to work with NULL values. It may not be the first one you think of, but it can be a very good choice. In this tip I will provide examples of how you can use COALESCE to peacefully coexist with NULL values. Before we dig in to...
When referring to NULL within our data sets, we often use phrases such as “the NULL value” or “a value of NULL.” I do it all the time. I see it done all the time. Such phrases are so common that we think little of their use. But inherent in the p...
SQL Server query optimizer decides to use an index seek operator when the operator cost is low and it can easily find matching records using the B-Tree structure. An index seek operator provides significant performance gains. In the below picture, theEstimated Number of Rows to be Read...
The COALESCE() function in SQL returns the first non-null value from a list of expressions. If all values are null, it returns null. It’s commonly used to handle missing values or combine multiple columns into one fallback output. When Should You Use COALESCE()? This function is useful...
This stored procedure is useful by running it from any query tool. However, Microsoft suggests that you follow these steps to perform blocking analysis: Following is the script you can use to create thesp_blocker_pss70stored procedure:
"EXECUTE AT" with Dynamic Linked Server Name "explicit value must be specified for identity column in table" error in SQL 2000 "FROM clause have the same exposed names. Use correlation names to distinguish them" "No transaction is active." error when trying to send a transactional SQL statmen...
(WKB) representation. Note: This method currently uses internal SQL Server format (CLR) to create a Geometry instance, which is a known issue in the driver and is planned to be changed to accept WKB data instead. For existing users who are already using this method, consider switching to ...
rows or this field isn't indexed, you can use:Just check: where value > '' -- not null ...
SQL user connections Monitoring user connections in SQL Server can be done using several methods. This section queries the system view to get the user connections for each database. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 USE MASTER GO DECLARE @DML nvarchar...