Management Studio)Step 1: Right-click the database you want to downgrade, press Select:Steps2: In the dialog box, select: Step 3: Select in "Advanced":Steps4: Save the script and run the script in SQLServer2005. Detailed steps can be seen: http://bbs.csdn.net/topics/390438560?page=1#post-394316973 in the 13 floor of the reply, there is step 5: Through the "task" → "Import data", Importing the data from 2008 to a library created using the script is done as follows:MethodTwo: Using the system's o
maximum number of cascade operations is 200.
Density
Calculation formula: 1. distinct values of all values (excluding histogram boundary values) in the first key column of the statistical information object. (0.0078125) the query optimizer does not use this Density value. It is displayed to be backward compatible with versions earlier than SQL Server 2008.
Average Key Length
Average
1. SQL SERVER Data Type
The data class is a type of data attribute, indicating the type of information represented by the data. Any computer language defines its own data type. Of course, different programming languages have different characteristics. The types and names of the defined data types are more or less different. SQLServer provides 25 data types:
Binary [(n)]
(' John Doe ', ' mathematics ', 84)Insertintotbvalues (' John Doe ', ' physics ', 94)GoSelect*fromtbGoName Course Score---------- ---------- -----------Zhang San language 74Zhang San Mathematics 83Zhang San Physics 93John Doe Language 74John Doe Mathematics 84John Doe Physics 942. Using SQL Server 2000 static SQL--cSelect Name,
Varbinary (8000)
Marked as for reference only. Not supported. Future compatibility is not guaranteed.
Offset
Smallint
The offset of the row in which this column is located.
Collationid
Int
The ID of the column sorting rule. This value is NULL for non-character columns.
Status
Tinyint
Bitmap used to describe the attributes of a column or parameter:0x08 = columns allow null values.0x10 = addVarcharOrVa
characters.
N
VARCHAR (n)
A variable-length string. A maximum of 8,000 characters.
varchar (max)
A variable-length string. A maximum of 1,073,741,824 characters.
Text
A variable-length string. Up to 2GB character data.
Unicode string:
Data Type
Description
Storage
NCHAR (n)
Fixed-length Unicode data. A maximum of
SQL Server data type character string:
Data Type
Description
Storage
CHAR (n)
A fixed-length string. A maximum of 8,000 characters.
N
VARCHAR (n)
A variable-length string. A maximum of 8,000 characters.
varchar (max)
A variable-length string. A maximum of 1,073,741,824 cha
Tags: des blog http using ar for file data spPre-Preparation:CREATE TABLE Employee (ID int NOT null primary key,Name nvarchar (4),credit_card_id varbinary (max)); ---Be careful with this data type.GoDescription: The index on this table will be deleted before the next index is created.--------------------------------------------------------------------------------------------------------------- -------------
Pre-Preparation:CREATE TABLE Employee (ID int NOT null primary key,Name nvarchar (4),credit_card_id varbinary (max)); ---Be careful with this data type.GoDescription: The index on this table will be deleted before the next index is created.--------------------------------------------------------------------------------------------------------------- ----------------------------------------------Operation 1,
size of the input table is variableImage binary data Type the image data type is used to store variable-length binary data up to 231-1 or approximately 2 billion bytes---------------------------------------------------(1) Binary data type binary data includes binary, Varbinary, and ImageBinary data types can be either fixed-length (binary) or variable-length. binary[(N)] is a fixed n-bit binary data. where n is the range of values from 1 to 8000. The
If you are in charge of a SQL Server-based project or you have just been in touch with SQL Server, you may have to face some database performance problems, this article will provide you with some useful guidance (most of which can also be used for other DBMS ).Here, I am not going to introduce the tips for using
MemToLeave). For multi-page-occupied memory, it is not possible to use the AWE feature of SQL Server, that is, in 32-bit SQL Server, the database can only use 2G of memory (user state) Even if AWE is turned on. This shows that AWE has increased the memory space of the data page buffer pool.Note: In 32-bit
[] [ ]Parameters:Partition_function_name: The name of the partition function. The partition function name must be unique within the database and conform to the rules of the identifier.Input_parameter_type: The data type of the column used for partitioning. When used as a partitioning column, except for text, ntext, image, XML, timestamp, varchar (max), nvarchar (max),
into
TB values (' Zhang San ', ' physical ', ') '
insert into TB values (' John Doe ', ' language ', ' the ')
insert into TB values (' John Doe ', ' math ', ' + ')
INSERT into TB values (' John Doe ', ' physical ', 94)
go
SELECT * from TB 2. Using SQL Server 2000 static SQL SELECT name,
Max (case course whe
Companyname+contactname Plus as a key column will not exceed 900 bytes, but the key size is larger, reducing the query efficiency)
Avoid adding unnecessary columns. Adding too many indexed columns (key columns or nonkey columns) has the following effects on performance:
Fewer index rows can be accommodated on a page. This increases the I/O and reduces cache efficiency.
More disk space is required to store the index. In particular, adding varchar (
SQL Server tool for writing stored proceduresFunction: creates an update stored procedure for a given table.Syntax: sp_genupdate
Table
Name
>
,
Primary
Key
>
,
Stored
Procedure name
>
Take the northwind database as an ExampleSp_genupdate 'ployees', 'employeeid', 'upd _ Employees'Note: If you create this process in the Master System database, you can use this process in all th
SQL Server tool for writing stored proceduresThe following are the source code of the two stored procedures:/* ===================================================== ======================================Syntax: sp_geninsert
Table
Name
>
,
Stored
Procedure name
>
Take the northwind database as an ExampleSp_geninsert 'ployees', 'ins _ Employees'Note: If you create this process in the Mast
cannot use an aggregate functionStart to specify the substring start positionLength returns the number of characters that cannot be negativereturn value:If expression is a supported character data type, character data is returned, and binary data is returned if expression is a supported binary data typeUse: Select substring (' hello ', +) LenGets the length of the string, but does not include the right space.Grammatical structure: LEN (string_expression)Parameter description: string to calculat
view, or a trigger. ', 1
Return
End
if exists (select 1 from Sys.sql_modules a where a.object_id=object_id (@Object) and a.definition is null)
Begin
--sql Server 2008
RAISERROR 50001 N ' object has been encrypted! '
--sql Server 2012
--throw 50001, N ' object has been encrypted! ', 1
Return
End
End
declare
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