3,将靶表中更新的数据插入到一个表中有两种方式,一种是output into,一种是使用insert into 第一种方式,使用ouput into方式,将数据插入到staging table中 ;mergeintodbo.tarast using dbo.srcassont.id=s.id--matched表示On子句匹配成功,加上额外的and条件,如果when子句成功,那么更新Targe表中的数据whenmatcheda...
SQL Server TSQL Pivot with Multiple ColumnsAs far as I know, you cannot use thePIVOTsyntax to ...
ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot Table query Adding a partition scheme to...
Output子句,用于输出在Target Table中更新的数据,在每个数据行中,有一个特殊的字段,$Action,数据类型是nvarchar(10),能够标识出Merge操作的类型:Insert Delete,Update。 <OUTPUT_CLAUSE> ::= { [ OUTPUT <dml_select_list> INTO { @table_variable | output_table } [ ( column_list ) ] ] | [ OUTPUT <...
create table numbers(n int) go declare @counter int set @counter = 0 while @counter < 400 begin set @counter = @counter + 1 insert into numbers select @counter end -- Create a temporary table containing the strings for which we will find the longest substring declare @test ...
Execution Engine: Executes the query per the instrucctions set out by compilation. Our customer has the following script: CREATETableAcademy_BlobData(IDINTIDENTITY(1,1)PRIMARYKEY,AgeINT,CustomerData NVARCHAR(MAX))DECLARE@TimesInteger=0WHILE(@Times<=100000)beginS...
--break up all words in a string into separate table rows SELECT value FROM dbo.RegexFind ('\b[\w]+\b', 'Hickory dickory dock, the mouse ran up the clock',1,1) --split text into keywords and values SELECT Match_ID, [keyword]=MAX (CASE WHEN submatch_ID=1 THEN submatchValue EL...
I used a permanent table to test this instead of a temporary table, but used the same sample data set from Jeff’s article. Also, I inserted these same rows 100K times so I had a large enough data set to be useful for performance testing. ...
(when needed). By taking a hash of an unencrypted value prior to encryption, we can create a column that can be indexed and searched when decryption is required. This allows us to greatly reduce the search space from a table scan to an index seek in which the resulting number of rows ...
the order in which the rows are evaluated, but itdoesdepend onallthe rows being evaluated. In the BOL example, the lowest EmployeeID is placed in the variable, apparently because it's the last one evaluated by a query that examines each row in table Employees in descending order by ...