how to check blank value in sql server

If we insert a value in the ID column, for example:Insert member (id, username) values (10, 'admin ')The query analyzer will return an error message:Reference contentServer: Message 544, level 16, status 1, Row 1When IDENTITY_Insert is set to OFF, explicit values cannot be inserted into the "member" column.In ASP, an error message is returned:Reference contentMicrosoft ole db Provider for SQL

--drop procedure zcstest;Create procedureZcstest (@tableName varchar(Max), @dataCount intoutput) as Declare @paramName varchar(Max) Set @tableName = LTRIM(@tableName) if @tableName is NULL or @tableName = "' begin Set @paramName = '@tableName' GotoArgumentNullExceptionEnd Declare @finalSql varchar(Max) Declare @getCountSql nvarchar(Max) Set @getCountSql =N'Select @dataCount =count (*) from' + @tableName execsp_executesql@getCountSqlN'@dataCount int Output',@dataCountOutputSet @finalSql = '

= Dalbase.executenonquery (commandtype.storedprocedure, strspname, pars); if (num > 0) { return true; } else { return false; } } Note: Table creation DataTable Dtstorepreseparationamount = new DataTable ("Dtstorepreseparationamount"); DTSTOREPRESEPARATIONAMOUNT.COLUMNS.ADD ("Preseparationid", Type.GetType ("System.Int32")); DTSTOREPRESE

output parameter to it using the Add method Try { Conn. Open (); Cmd. ExecuteNonQuery (); IRet = (decimal) cmd. parameters["@Amount"]. Value; Gets the output parameters in the stored procedure } catch (SqlException ex) { Throw ex; } Finally { Conn. Close (); } return iRet; } C # Gets the result set: Copy Code code as follows: String sqlw = String. Format ("exec sp_userinfo {0}", UID); DataTable Dsuser = Sqlconn.getda

After inserting a record, you want to immediately obtain the primary key return value in the data table. This primary key is automatically generated. In fact, there are many implementation methods, such as performing another query and obtaining it. You can also extract the maximum value before inserting data and add one to the maximum value. There are many method

The example in this article describes how C # queries a SQL Server database and returns a single value. Share to everyone for your reference. The implementation methods are as follows: ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 static public string getsqlasstring (String sqltext, sqlparameter[] sqlparameters, string databaseconnectionstri

core elements are: partition, sort and frame SELECT DISTINCT name,MaxAge, Max (case maxagenum if 1 then addtime else "end") over (partition by name) Maxaddtime,Minage,max (case minagenum if 1 then addtime else "end" over (partition by name) MinaddtimeFrom (Select Name,addtime,Max (age) over (partition by name) MaxAge,MIN (age) over (partition by name) Minage,RANK () over (partition by name ORDER BY age desc) Maxagenum,RANK () over (partition by name order by age) Minagenum from students) s The

Declare @ Rsql Varchar ( 250 ) Declare @ Csql Varchar ( 300 ) Declare @ RC Nvarchar ( 500 ) Declare @ Cstucount Int Declare @ Ccount Int Set @ Rsql = ' (Select classroom_id from ea_roomtime where ZC = ' + @ ZC + ' And XQ = ' + @ XQ + ' And t ' + @ Time + ' = '' No '' ) And classroomtype = '' 1 ''' -- Exec (@ rsql) Set @ Csql = ' Select @ A = sum (teststucount), @ B = sum (classcount) from ea_

Today, when cleaning up business-Library data, developers say they can use TRUNCATE table to clean up all data from two tables Both tables have their own ID, all made table partitions, single table 200GB, two tables using SELECT ident_current (') The current self appreciation is 3000012, the two tables are almost identical, except for one or two fields. I executed two SQL statements, truncate all two tables, and then forgot to shrink the database a

The original planning number field is text. Format without changing the type SUM (CAST (number As Integer)) Instance code: The code is as follows Copy Code Msql= "Select SUM (CAST (field name as Integer)" from table name where conditional language name "Mrs.open msql,conn,1,3Response.Write MRs (0)Mrs.closeSet mrs=nothing%> Here are some numbers to sum Use the sum (SUM) functionThe SUM function is used to return all the values in an expression A few not

Declare @ areavarchar (120); set @ area01 +, + 02; selectschoolnamefromschool_infowherecodein (@ area), but the result cannot be obtained. I think it may be that the @ area assignment method is incorrect, but I have tried many ways. Try to make up a dynamic SQL statement and execute it using exec. Declare @ area varchar (120); set @ area = '01 '+', '+ '02'; select schoolname from school_info where code in (@ area ), but cannot get the results. I think

If you have seen this, you will see insus.net in SQL Server2008 using the simplest method to get to the midnight time value. Then you might ask how to get the maximum time value for the current system date, such as Yyyy-mm-dd 23:59:59.997. We can use the DateAdd function to implement, with the midnight time value of

I. Problems The table is as follows: Obtain the following results: Ii. solution 1 Use XML Conversion The Code is as follows: Create Table body (ID int, body nvarchar (20) goinsert into body values (1, 'aaa') insert into body values (2, 'bbbbb ') insert into body values (1, 'cccccccc') insert into body values (3, 'ddddd ') goselect * From bodyselect distinct. ID, stuff (select ',' + body from body where id =. ID for XML Path (''),'') as bodyfrombody a -- the specific idea is as follows: Select

select|server| variable | statement declare @user nvarchar (20) Select @user = ' User1 ' Use CountMe /* To determine whether the user exists * * DECLARE @userweek int Select @userweek =[week] from base where userid= @user SELECT @ @rowcount If @ @rowcount =0 Return Select @userweek The result of the final @userweek print is to record the value of the week field with the user name User1. And when we sele

Label:Scenario: If the primary key of this table or one of the columns uses IDENTITY (total) self-growth, but you want to manually specify a value for this column, use the following solution:SET IDENTITY_INSERT table name onUse this command to set the self-increment column of the table to OnThen use:SELECT 3, 0, ' Adolph ', 141,0,2, ' 133 ', ' 3:23pm ', ' 133 ', ' 3:23pm ', 0, ' NULL ', insert the data (the way you use SELECT, you cannot insert into

server| Policy data integrity is a key point for any database system to ensure. Regardless of how well the system is planned, the problem of NULL data values always exists. This article explores the 3 issues involved in handling these values in SQL Server: counting, using null table values, and foreign key processing. Handling Null values with COUNT (*)

I. BACKGROUND The ID field in table A in the SQL Server database is defined as: [ID] [int] IDENTITY (1,1), and as the data grows, the ID value is close to 2147483647 (int's range is:-2 147 483 648 to 2 147 483 647) , although the old data has been archived, but this table needs to keep the most recent 100 million data, what is the method to solve the problem of

IntroducedStarting with the SQL Server 2012 version, when the SQL Server instance restarts, the values for the autogrow column of the table will jump, and the size of the specific hop value depends on the data type of the growth column. If the data type is integer (int), the

statements by reducing the number of reads.As for the pre-read scenario, we have previously analyzed that the data is preloaded by another thread when the T-SQL query statement is optimized.So this thread actually has a reference value when reading the data, and the data can be read from this reference to ensure that most of the data is useful, that is, to increase the cache hit rate mentioned above.About

SQL uses three-valued predicate logic, so the result returned by a logical expression can be true, false, or unknown, and returning true in the three-value logic is not exactly the same as not returning false.SQL handling of query filtering conditions: Accept Ture deny false and unknownSQL handling of CHECK constraints: Accept FALSE deny TRUE and UNKnown