sql server update multiple columns

SQL Server concurrent processing, update solution discussion, SQL Server Preface In this section, we will talk about the most common situation of concurrency, that is, update. If no row record exists in concurrency, insert it. At

Target database for Microsoft Strength Database: AdventureWorks20121. SQL Statements:SELECT DISTINCTC.table_schema, C.table_name, C.column_name, C.data_type, C.is_nullable, Tc. Constraint_type,CONVERT(INT, C.numeric_precision) Numeric_precision, C.numeric_scale, C.character_maximum_length, C.ordinal_position, Tc.CON Straint_name,ColumnProperty(object_id(C.table_schema+ '.' +c.table_name), C.column_name,'isidentity') isidentity, (SELECT Case when

The Design view of access has a good feature-----design column annotations, which allows the designer to see clearly the meaning of each column. The general SQL Server does not have this function when building a table, but he has extended properties, this function is also good, you can write the comments here, and then the corresponding results as RS back to the page to apply I think it might be useful to d

temporary table is created by a stored procedure or an application executed by multiple users at the same time, SQL Server must be able to differentiate the tables created by different users. Therefore, SQL Server adds a digital suffix to the table name of each local tempor

For SQL SERVER 2000 and earlier versions, you must use an auto-incrementing column and a temporary table.Copy codeThe Code is as follows:SELECT [AUTOID] = IDENTITY (int, 1, 1), * INTO # temp_table FROM table name;Copy codeThe Code is as follows:SELECT * FROM # temp_table;Since SQL server 2005,

primary key)Insert into # mytemptable values (1) If a local temporary table is created by a stored procedure or is executed by multiple users at the same timeProgramSQL Server must be able to differentiate the tables created by different users. Therefore, SQL Server adds a digital suffix to the table name of each lo

SQL Max and such aggregate functions can only be for the same column of n row operations, if the N column operations, generally use case statements to judge, if the column is relatively easy to write, the list of more trouble. -------------------------------------------------------------------------------- /* Test Name: Use XML to find aggregations between arbitrary columns Test function: do min, Max, SUM,

: Table_source Pivot (aggregate function (Value_column) pivot_column for (columnlist)) A little explanation: Table_source: Is the table we want to convert. Pivot_column: Is the column name for row to column. Value_column: Is the value of the column after the conversion. Columnlist is the column to be generated. This is also the case with pivot, which can be used to write the same result: Select Studentname, [Chinese] Chinese, [math] math, [English] 中文版 from (SELECT * from

table [Table name] Drop constraint name Create Default ValueAlter table [Table name] add constraint default name: Default \ '51windows. Net \ 'for [field name] Delete default valueAlter table [Table name] Drop constraint default name Delete logs in SQL Server to reduce the size of database filesDump transaction database name with no_logBackup log database name with no_logDBCC shrinkdatabase (database name)

Tag:select occupancy identitytypesfrom joinproperty.classcase select (casewhena.colorder=1thend.nameelsenullend) table name, a.colorder field ordinal,a.name field name, (Casewhencolumnproperty ( a.id,a.name, ' isidentity ') =1then ' √ ' else ' end ' logo, (case when (Selectcount (*) FROMsysobjectsWHERE (name in (selectnamefromsysindexeswhere (id=a.id) AND (indidin (selectindidfromsysindexkeys WHERE (id=a.id) AND (colidin (SELECT colidFROMsyscolumnsWHERE (id=a.id) AND (name= (A.name)))))) AND (

Error behavior: Microsoft OLE DB Provider for SQL Server error ' 80040e2f ' cannot insert value NULL into column ' id ', table ' Web.dbo.dingdan '; column does not allow null values. INSERT failed. /untitled-2.asp, line 115 Reason Analysis: SQL database, the ID column identification specification is not set to Yes when the table is established. So when you

Aggregate functions such as SQL max can only perform n-row operations on the same column. If n-column operations are performed, the case statement is generally used for determination. If the number of columns is small, it is easier to write, if there are too many columns, it will be troublesome. --------------------------------------------------------------------

For SQLSERVER2000 and earlier versions, an auto-incrementing column must be used in combination with a temporary table. For SQL SERVER 2000 and earlier versions, you must use an auto-incrementing column and a temporary table. For SQL SERVER 2000 and earlier versions, you must use an auto-incrementing column and a tem

Server This article mainly summarizes how the identity column is handled in replication 1. Snapshot replication In snapshot replication, you typically do not need to consider the attributes of an identity column. 2. Transactional replication Example: Publish database A, subscribe to database B, publication is t_test_a, subscription table is T_test_b CREATE TABLE t_test_a (ID int IDENTITY (1,1), Name varchar (50) ) CREATE TABLE T_test_b (ID int IDENT

SQL Max such aggregate functions can only be for the same column of n row operations, if the N column operations, generally use case statements to judge, if the column is relatively easy to write, the list of more trouble. --------------------------------------------------------------------------------/* Test name: Using XML Find aggregations between arbitrary columns Test functionality: Make min, Max, SU

--Add columnsIF not EXISTS (SELECT * from syscolumns WHERE id=object_id (' tbl_tranwoandcochistorybyrailassure ') and name= ' CreatedDate ' )BEGINALTER TABLE Tbl_tranwoandcochistorybyrailassureADD createddate DATETIME not NULL DEFAULT GETDATE ()END--Modify ColumnsIF EXISTS (SELECT * from syscolumns WHERE id=object_id (' tbl_tranwoandcochistorybyrailassure ') and Name= ' CreatedDate ')BEGINALTER TABLE Tbl_tranwoandcochistorybyrailassureALTER COLUMN createddate NVARCHAR (10)END--1. Deleting a colu

=''SELECT @ str = @ str + ',' + value FROM tb WHERE id = @ idReturn stuff (@ str, 1, 1 ,'')ENDGO-- Call a functionSELECt id,Value = dbo. f_strUnite (id) FROM tb group by idDrop table tbDrop function dbo. f_strUniteGo-- ===================================================== ========================================================== ====2. New Solution (using OUTER in SQL server 2005APPLY .)Create table tb (i

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 USE DBProjectSY GO SELECTOBJECT_SCHEMA_NAME(T.[object_id], DB_ID()) AS [架构名] , T.[name] AS [表名] , AC.[name] AS [列名] , TY.[name] AS [系统数据类型] , TY.is_user_defined AS [是否用户自定义类型],--1 = 用户定义类型,0 = SQL Server 系统数据类型 AC.[max_length] [最大长度], AC.[precision] [精确度],--如果列包含的是数值，则为该列的精度；否则为0 AC.[scale] [数值范围],--如果列包含的是数值，则为列的小数位数；否则为0 AC.[is_nullab

Consider the following: When the update value is the same as the original value, does SQL Server actually update or ignore it? For example: UpdateTbnameSetName='ABC' --The original value of name is ABC.WhereID=1 Another example is: UpdateTbnameSetName='ABC' --The original value of name is ABC.WhereName='ABC' N

I tried multiple times and finally concluded that when multiple SQL Server tables are associated with update, an as Alias cannot be added to an external table, and a syntax error is returned.Only the table name can be written as the prefix for reference and cannot be referen