sql server update table from another table

byValExecution Result:Case-Search expression:SELECTOrderID, CustID, Val, Case whenVal 1000.00 Then ' less Then' whenValbetween 1000.00 and 3000.00 Then 'between' whenVal> 3000.00 Then 'More than' ELSE 'Unknown' END asvaluecategory fromSales.ordervalues;Execution Result:Sorting rulesIf you want the collation of a column to be case-insensitive, you can modify the collation of an expression as follows:SELECT Empid, FirstName, LastName fro

=obj.id andObj.xtype= 'U' andObj.status>= 0 Left JOINDbo.syscomments Comm onCol.cdefault=comm.id Left JOINSys.extended_properties EP onCol.id=ep.major_id andCol.colid=ep.minor_id andEp.name= 'ms_description' Left JOINSys.extended_properties Eptwo onObj.id=eptwo.major_id andeptwo.minor_id= 0 andEptwo.name= 'ms_description' WHEREObj.name= 'Sys_user'--

There are many ways for SQLServer to search for and delete duplicate records in tables. Below I will list several commonly used SQL statements with good performance. If you need them, please refer to them. There are many ways for SQL Server to find and delete duplicate records in tables. Below I will cite several commonly used

indicates the error number, @ rowcount indicates the number of affected rows. For example, let's look at the statement for creating table variables: DECLARE @ News Table(News_id int not null,NewsTitle varchar (100 ),NewsContent varchar (2000 ),NewsDateTime datetime) You can select, insert, update, and delete

has only one allocation unit. IN_ROW_DATA indicates that this allocation unit is only used to store specific data. There are 5353 pages in total, 5346 pages are used, and 5320 pages of data are occupied. To view the location of the root page, run the following command: Note that the root page shown here is 0xec000001100. Due to the storage relationship, it is parsed in reverse order, that is, 0x0011000001EC, the first two bytes indicate the number of the file group, and the last four bytes i

@para = ' Select @headfct = @head + ' tree ' Select @content = @selectFieldStr Select @headfct +char (+ @para +char) + ' as ' +char + @content +char (+char) + ' Go ' +char (13) --del Select @headfct = @head + ' Del ' Select @para = @pkeyParaStr --test --select @paravar, charindex (' @IsValid ', @paravar) If CHARINDEX (' IsValid ', @selectFieldStr) >0 Select @deleteStr =replace (replace (@deleteStr, ' delete ', ' Update '), ' where ', ' Set isvalid=0

] [nvarchar]( -),7 [Result] [nvarchar]( -),8 [EndTime] [datetime],9 [Legal] [tinyint]Ten ) One A GOCreate a stored procedure1 CREATE PROCUsp_getdata2 as 3 BEGIN4 DECLARE @tblSDTbldata5 6 BEGIN TRANSACTION7 INSERT into @tblSD8 (CMD,9 Num,Ten Name, One Innerid, A Result, - EndTime, - Legal the ) - SELECTCMD, - Num, - Name, + Innerid, - Result, + EndTime, A Legal at fromData - -

pages, so the maximum number of records per row can only be 8k, which is why char and varchar are limited to 8k in size, and storing more than 8k of data should use the text type. In fact, the text type of the field value can not be directly entered and saved, it is to store a pointer to a number of 8k data page composed of the expansion area, the real data is actually placed in these data pages. When to set the index 1. Define a data column for the primary key (

Many friends asked SQL server database "generate scripts" and exported only the SQL scripts of the database, while the data in the table is still not exported. It is very simple. Take a look at the Tutorial: Note: I use SQLServer2008 here. Other versions should be similar. 1. Select the database to be exported-> task

Http://blog.sina.com.cn/s/blog_a342ff0a0101u3kb.htmlSQL Server:Solution 1:select Top * from a where ID not in (select top with ID from a);Solution 2:select Top * from a Where ID > (select MAX (ID) from (select top with ID from a) as A);As I understand it,The first method: first 30 data (the default positive order) is queried based on the ID, and then the first 10 data in the 30 data is queried in the positive order.The second method: first, according to the ID positive sequence query the top 30

1N'language',1 Union All Select 2N'Mathematics',2 Union All Select 3N'English',3 Union All Select 4N'Physical',4 Insert intoTblscoreSelect 1,1, About Union All Select 1,2, + Union All Select 1,3, the Union All Select 1,4, - Union All Select 2,1, - Union All Select 2,2,Bayi Union All Select 2,3, the Union All Select 2,4, the Union All Select 3,1, the Union All Select 3,2, - Union All Select 3,3, the Union All Select 3,4, About Union All Select 4,2, the Union All Se

The source of this article: http://www.cnblogs.com/wy123/p/7106861.html(It is not the original works right to retain the source, I my book still far to reach, just to link to the original text, because the following may exist some errors to amend or supplement, without him)Recently encountered in SQL Server several times the developer submitted the performance problem of

1. Get all database names:Select name from Master .. sysdatabases order by name 2. Get all table names:Select name from databasename .. sysobjects where xtype = 'U' order by nameXtype = 'U': indicates all user tables;Xtype = 's': indicates all system tables; 3. Get all field names:Select name from syscolumns where id = object_id ('tablename ')In ms SQL Server,

1 Declare @name varchar( +)2 Declare @sql varchar( +)3 4 if object_id('tempdb: #space') is not NULL Drop Table#Space5 Create Table#Space(Namevarchar( -), Rowsbigint, reservedvarchar( A), datavarchar( A), index_sizevarchar( A), unusedvarchar( A))6 7 DeclareSpcursorLocal for Select '['+Name+']' fromsysobjectswhereType= 'u'8 OpenSP9 FetchSp into @nameTen while @

1. Create SQL Server audits Use master Go CREATE SERVER AUDIT Serveraudit To file (FILEPATH = ' D:bakaudit ', MAXSIZE = 1 GB)-Note Change file path With (on_failure = CONTINUE); Go 2. Create a server audit specification Use Slxsina Go CREATE DATABASE AUDIT specification Product_nostandard for

Partition please think twice:1, although the partition can bring many benefits, but also increased the implementation of object management costs and complexity. Therefore, consider carefully before partitioning to determine if the object should be partitioned.2, after determining the partition for the object, the next step is to determine the partition key and the number of partitions. To determine partition data, you should first evaluate whether there are logical groupings and patterns in your

Create Trigger TRI_ASBBegin DECLARE @rk int DECLARE @ck int DECLARE @sid varchar (20) Select @sid = commodity code, @rk = number of inbound, @ck = number of outbound from inserted INSERT into BSB (product code, quantity) values (@sid, @[email protected]) Else Update BSB Set quantity = Quantity + (@[email protected]) where commodity code [email protected]EndSQL Update Modify Delete a

SQL Server System table sysobjects describes and usesAll information about the SQL Server database is stored in its system table. I wonder if you have spent more time checking the system tables because you are always busy with use

for the column PersonID --nameNamenvarchar( -) not NULL,--Create a column with Unicode non-fixed length (up to 20 Unicode characters stored) name --AgeAgeint not NULL CONSTRAINTCk_ageCHECK(age>= - andAge -) ,--Create an integer that constrains the check constraint to a column age --SexGenderbit not NULL CONSTRAINTDf_genderDEFAULT(1) ,--Create a column of type bit with a default value of 1 (True) gender --Identity Information [Identity] nchar( -) not NULL CONSTRAINTCk_identityCHE

Recently, I used a SQL Server cache to increase the data volume by a day and receive queries from customers. The speed is getting slower and slower as the data volume grows. Review Frequently Used Indexes I. Clustered Index The page level of the clustered index includes the index key and data page. Therefore, the answer to what the leaf level of the clustered index stores besides the key value is ev