sql server sparse columns performance

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Read and Write Big Data columns from SQL Server.

Public Static Void Main () { // Write large objects Sqlserver Filestream FS = New Filestream ( " C: \ test.bmp " , Filemode. Open, fileaccess. Read );Binaryreader br = New Binaryreader (FS );Sqlconnection Conn = New Sqlconnection ( " Server = localhost; uid = sa; Pwd = sa; database = northwind " ); String Plain text = " Update employees " + " Set photo = @ image where employeeid = 1 " ;Sqlcomm

In the page, use the extended properties of SQL Server to display comments for columns as access

Access|server| Show | Page Access's Design view 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 resu

Performance Test Training: SQL Server performance Test Analysis performance impact of local variables

Label:Poptest is the only training institute for developing Test and development engineers in China, aiming at the ability of the trainees to be competent in automated testing, performance testing and testing tools development. In Poptest's LoadRunner training, in order to improve the performance of students experience, add a lot of server optimization knowledge,

In the page, use the extended properties of SQL Server to display comments for columns as access

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

Rules for partitioning columns in SQL Server partitioned views

Tags: Map SQL Server operator arithmetic rules overlap List section allowsPartitioning column RulesThe partitioning column exists on each member table and identifies the available data in a particular table through a CHECK constraint. The partitioning column must adhere to the following rules:Each base table has a partition column that has key values enforced by the CHECK constraint. The key range of the CH

SQL Server deletes data columns

Delete data columnsThe data columns that are built, wrong, or duplicated in the development or production process need to be deleted.Use the SSMS database management tool to delete data column mode one1. Open database--Select data Table-"Expand Data Sheet-" Expand Data Column-"Select the data column to delete-" Right click-"SELECT Delete-" in the Pop-up box click OK.Way Two1. Open Database-"Open data Sheet-" Right click-"SELECT Design.2, in the Design

SQL Server gets all the columns

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

SQL Server group removal from multiple columns

Label:Let's take a look at the example below: Table tables Field 1 Field 2 ID Name 1 A 2 b 3 C 4 C 5 b The library structure is probably like this, this is just a simple example, the actual situation will be much more complex. For example, if I want to use a single statement to find all the data that name does not repeat, then you must Use distinct to remove redundant duplicate records. The results from the select DISTINCT name from table are: ---------- Name AC It seems to be working, but what

SQL Server Pivot/unpivot rows and columns

: 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

Resolve the aggregation between any SQL Server Columns

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. --------------------------------------------------------------------

computed columns in SQL Server server

Tags: compute Ros man Date Judge Special One create MicThe computed column differs from the column that requires us to assign the value manually or by the program, whose value is derived from the computed value of the other columns in the table. For example, if a table contains a quantity column number and a price column, we can create a calculated column amount amount to represent the result value of the quantity * unit price, and after the amount co

How to remove the maximum and minimum values from multiple field columns in SQL Server

Existing table table1, four int field f1,f2,f3,f4, now query to get the maximum value in the four column and only need to return the maximum value Method One: Select Case if F12>f34 then F12 else F34 end as Maxnum to (Select Case when F1>f2 then F1 else F2 end as F12 , case when F3>f4 then F3 else F4 end as F34 to table1) as T1 ORDER BY maxnum Desc The effect is as follows: Method Two: Select top 1 * "from" ( select F1 as Maxnum, ' F1 ' as ColumnName from TABLE1 UNION SELECT F2

How to Implement SQL Server serial number Columns

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

Informal discussion on identity columns in SQL Server (ii)

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 Server syntax for inserting partial columns from another table in the whole table and syntax for inserting a temporary table directly using the select statement)

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 temporary table internally. The full name of a temp

SQL Server syntax for inserting partial columns in another table and for inserting temporary tables directly using select statements

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 local temporary table internally. The full name

SQL Server Splits a column into multiple columns

The data table contains a column of data, as shown in 1: Figure 1 data table Now we need to divide the data in this column into three columns. The SQL code is as follows: 1, SelectMax (case when F1 % 3 = 1 then F1 else 0 end),Max (case when F1 % 3 = 2 then F1 else 0 end) B,Max (case when F1 % 3 = 0 then F1 else 0 end) cFrom hlr151Group by (F1-1)/3 Effect: 2, SelectC1 = A. F1, C2 = B. F1, C3 = C.

Resolve aggregation between any columns in SQL Server

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

SQL Server trigger (TRIGGER)-triggers a "go" when updating a few columns of data

Tags: and insert ROM info level creat update Set SelectCREATE TRIGGER [dbo]. [Updataalarmlevel]on [dbo]. [Alarm_alarm_info]After inserts, update– after updating and insertingAsBEGINIf update (transfernum) or update (Potentialloss) – event triggered if the Transfernum or Potentialloss two column in the Alarm_alarm_info table changes;declare @transferNum int;DECLARE @potentialLoss decimal (20,2);declare @alarmLeve int;Select @transferNum =transfernum from inserted;--inserted represents the current

SQL Server Add or modify columns

--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

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