types of cursor in sql server

Excel|server SET ansi_nulls off Go SET NOCOUNT on Go SET LANGUAGE ' Simplified Chinese ' Go DECLARE @tbl nvarchar (@fld nvarchar), @sql nvarchar (4000), @maxlen int, @sample nvarchar (40) SELECT d.name tablename,a.name fieldname,b.name typename,a.length length,a.isnullable into #t From Syscolumns A, systypes b,sysobjects D WHERE A.xtype=b.xusertype and A.id=d

, 1753 to December 31, 9999, the accuracy is 3.33 milliseconds. 8 bytes DateTime2 From January 1, 1753 to December 31, 9999, the accuracy is 100 nanoseconds. 6-8 bytes smalldatetime From January 1, 1900 to June 6, 2079, the accuracy is 1 minutes. 4 bytes Date Only dates are stored. From January 1, 01 to December 31, 9999. 3 bytes Time Storage time only. The accuracy is 100 nanoseconds. 3-5 by

I. Scenarios In SQL Server 2005, there is a table TestDatetime, where the data type of the Dates field is datetime. If you see a table record, what do you first think? (Figure 1: Data List) When you see this data, do you think this design is a waste of storage space and makes the index of this column increase, making the query slower, you also want to use some other data

Differences between varchar and nvarchar: Varchar (n)Variable-length and non-Unicode character data with a length of n Bytes. N must be a value between 1 and 8,000. The storage size is the actual length of the input data bytes, rather than n Bytes (such as varchar (6). When the field is qqq, the actual space occupied by the database is 3 bytes, instead of 6 bytes, it can only store 6 bytes. Generally, Chinese occupies two bytes ). Nvarchar (n)Unicode data with a variable length of n characters.

MS SQL Server 2000 system data type: (from SQL Query Analyzer) 1bigint Integer (integer) data from -2^63 to 2^63-1 2binary fixed-length binary data, up to 8,000 bytes 3bit integer data with a value of 1 or 0 4char fixed-length non-Unicode character data, 8,000 characters long 5cursor the data type used for a variable or stored procedure output parameter that cont

-length data, and the index on achar field is highly efficient, such as defining char(10), which takes up 10 bytes of space regardless of whether the data you store is 10 bytes. VARCHARStore variable length data, but the storage efficiency is not high, if the value of a field may be not fixed length, we only know it cannot exceed 10 characters, it is the most advantageous to define it as VARCHAR(10). The actual length of the VARCHAR type is +1 of the actual length of its value. Why "+1"? Th

Tags: BSP double absolute value Variable eval front end data type decimal addThere are two characteristics of data in a computer: type and length. The so-called data types are the types of data that are divided by the way data is represented and stored.Each variable, parameter, expression, and so on in SQL Server has a

The date and time data from January 1, January 1-20, 1900 to January 1, June 6 are accurate to minutes.String Char A fixed length of non-Unicode characters. The maximum length is 8,000 characters. Varchar Variable-length non-Unicode data, which can contain a maximum of 8,000 characters. Text Variable-length non-Unicode data. The maximum length is 2 ^ 31-1 (2,147,483,647) characters.Unicode string Nchar Unicode data of a fixed length. The maximum length is 4,000 characters. Nvarchar A variable-l

There are many types of ASP. NET database operation code. Today, let's take a look at four typical types of SQL Server code. DataReader for ASP. NET database operation code Function: DataReader reading class, which reads data only forward. Read-only and inbound data streams. Because there is only one row of data in the

ArticleDirectory Preface Preface PostgreSQL 8.1 was launched. I plan to migrate some SQL server applications to PostgreSQL. The first thing I need to migrate is tables, therefore, we must first figure out the ing relationship between the data types in the two databases. I checked the PostgreSQL documentation and made the following table to help you.

Unicode Character Set is generated to solve the incompatibility problem of character sets. All its characters are expressed in two bytes, that is, English characters are also expressed in two bytes.If you are still struggling with this issue, let's take a look at the explanation below and make a decision.Generally, if you use Chinese characters or other special characters, I will use the type starting with n. Otherwise, I will directly start with var.What is the difference between varchar and Nv

1. Exact numeric type Bigint Int Smallint Tinyint Bit Money Smallmoney 2. Balanced Data Type, Ms is recommendedVarchar (max)Replace text Char Varchar Text 3. Approximate numeric type Decimal Numeric Real Float 4. Unicode string type Nchar Nvarchar Ntext 5. binary data type,Recommended varbinary for MS(Max)In place of the image data type,Max =231-1 Binary (N)Stores fixed-length binary data Varbinary(N)Stores variable-length binary data in the range of N~ (1,8000) Image Stores image information 6.

In SQL, the varchar type is converted to int and then sorted, if our database ID is set to varchar type, the order by ID when queried.If the ID of our database is set to the varchar type of the order by ID at the time of the query, we do not want to see the following situation.We can convert varchar to int and then sortOneCopy CodeThe code is as follows:SELECT * from Yourtable order by cast (yourcol as int);For SQ