sql not null constraint

Each time you import an Excel table to the database, several more rows are displayed as 'null' rows. The following prompt is displayed when you delete the table. "The key column information is insufficient or incorrect. Update affects multiple rows! " Solution: You can see from your description that you have imported data from Excel to SQL Server. The imported table does not have a primary key column, and

Error: MSG 8178, Level A, State 1, line 0The parameterized query ' (@DocumentName varchar, @DocumentPath varchar, @Document ' expects the parameter ' @ documentFormatType ', which was not supplied. Change the @documentformattype=default to @documentformattype=null and execute it successfully. When adding a new piece of data, some fields need to be null, do not know if it is me vs. -----------------------

Tags: weight GPO Limit temp log sele SQL statement from codeCOALESCE (Specification, ") Or COALESCE (spec., 0) Select * from ( SELECTP2.name_template products, p3.pname materials, p3.spec dimensions, (SelectC2.name fromProduct_part_info C1 Left JOINRes_huo C2 onc1.hpartner_id=C2.idwhereP3.id=c1.product_tmpl_idOrder byC1.id limit1) Customers, (SelectKhwl_code fromProduct_custo_infowhereP3.id=product_tmpl_idOrder byID limit1) Item number, P4.name in

When querying a database using MyBatis recently, it was found that the result was a value when executed separately in PL/SQL, but Null was obtained in the program, with the following configuration:(1)monitortaskstatusmap" >(2)Resulttype="Monitortaskstatusmap">Select B.batch_num, C.called_phonenum,c.task_statusFrom Cc_call_task CLeft JOIN Cc_batch_calledperson bOn c.batch_id = b.batch_idwhere B.batch_type in

Copy Code code as follows: CREATE function GetColor (@ well number varchar (50), @ Layer varchar (50)) Returns varchar (200) As Begin declare @sql varchar; set @sql = ' --distinct Select @sql = @sql + color + ', ' from ( Select distinct color from yourtablename where Well number =@ well numbe

During the development process, you must call the stored procedure and configure the parameter ing in the configuration file of ibatis. However, the "invalid column type" error (SQL State [null] error code [17004]) occurs. Many people have encountered this problem online, and are finally located on the jdbctype in the configuration file. The value of jdbctype must be defined in the value defined in the Ja

Label:createtran empty string datetimecase valdivservensa Select Top Ten -- (case when ZB. Order_createdon is null and then "when ZB. Order_createdon -isnull (ZB. Order_createdon, '), *ZB. Order_createdon,* from dbo. Gkorder ckleftjoins on CK. OrderID=ZB. Order_transactionid SQL Server datetime type NULL cannot be judged by IsNull (datetime, '), which causes 1900

Label:SQL Server TSQL in the case of string concatenation, it is necessary to initialize the string, Set @errorMsg + = N ' table role has no key ' + '. ' If the @errormsg is not assigned an initial value, the Select @errorMgs will always get null; Declare @errorMsg nvarchar( -); Declare @tmpErrorMsg nvarchar( -); Declare @pkCount int; Declare @PKTable Table(Table_qualifiervarchar( -), Table_ownervarchar( -), table_namevarchar( -), column_namevarchar(

Tags: note col int operation class last lookup field strongSqlNULL Value A NULL value represents an unknown data that is missing. By default, the columns of the table can hold NULL values. This chapter explains the is null and is not NULL operators. SQL

anti-patterns :Using NULL is not an anti-pattern, and the inverse pattern is to treat null as a normal value or use an ordinary value instead of NULL.There is a case where null is considered to be a normal value, which is when importing or exporting data.solution : Treat a null value as a special value　1. Use

Copy Code code as follows: SET @SQL = ' SELECT * Comment with (NOLOCK) WHERE 1=1 and (@ProjectIds is Null or ProjectID = @ProjectIds) and (@Scores is null or Score = @Scores) ' Remember, in the past when doing Oracle development, this writing will lead to a full table scan, not indexed, do not know whether

Tags: LVS and List serve log enter war field dataWhen you use join for two dataframe in Spark SQL, the value of the field as a connection contains a null value . Because the meaning of the null representation is unknown, neither does it know that the comparison of null values in SQ