what is function in sql

Numeric Functions1, the remainder function mod (x, y)MoD (x, y) returns the remainder after X is removed by Y, and the MoD () also works for numbers with fractional parts, returning the exact remainder of the division operation.2. Function truncate (

MongoDB SyntaxMongoDB benefits Quite a lot, such as multi-column index, query can use some statistical functions, support multi-conditional query, but the current multi-table query is not supported, you can find a way to solve the problem of

For beginners of SQL, the concept of null values often creates confusion, and they often assume that null is the same thing as a MySQL empty string. This is not the case. For example, the following statement is completely different:mysql> INSERT

How SQL SERVER 2000 obtains the current system time with SQL statements is to use GETDATE (); getdate in SQL () A very powerful date format function in SQL Server Select CONVERT (varchar), GETDATE (), 0): 2008 10:57am Select CONVERT (varchar)

An internal forum was created using the Forum program provided by the dynamic network. Originally, this forum is posted on the IIS5 of Windows2000. His database is in Access. However, when I moved this forum to windows2003, I found that I often died.

emule resources can also be downloaded with thunder The following is a list of files that are shared by users, and you can download them by clicking on them after you install emule [0 Basic science sql.server.2005

Objective In this section we'll talk about simple query examples and places to look at, short content, and deep understanding. EOMONTH In the tutorial example of SQL Server 2012, for queries on sales.orders tables, you need to return orders for

The TRIM function in SQL is used to remove the header or the end of a string of characters. The most common use is to remove the blank at the beginning or end of the word. This function has different names in different repositories: Mysql:trim ()

You can create database objects in a SQL Server instance that can be programmed in assemblies created in the Microsoft. NET Framework Common Language Runtime (CLR). database objects that can take full advantage of the rich programming patterns

For beginners of SQL, the concept of null values often creates confusion, and they often assume that null is the same thing as an empty string. This is not the case. For example, the following statements are completely different: Mysql> INSERT into

If you are recovering a database in progress and need to do a few steps after the recovery process, you can use the DATABASEPROPERTYEX () system function to check the status of the recovery process. The State property of this function will indicate

GUID (Global unique identifier) Globally unique identifier, which is a 16-byte binary value generated by the identity number on the network card (each network card has a unique identification number) and the unique number of the CPU clock.The format

These two days are engaged in this thing, from the beginning of a little understand, to now can independently complete this function! In this process, csdn a lot of cattle people have given me a lot of help, in this express Shipi thanks! Write this

SQL means structured Query language, whose main function is to communicate with various databases. A query refers to a request for data stored in SQL. The task that the query completes is to provide the result set of the Select statement to the user.

GUID (Global unique identifier) Globally unique identifier, which is a 16-byte binary value generated by an identity number on the network card (each NIC has a unique identification number) and a unique number of CPU clocks. The GUID is formatted

A string that requires a location in the string AA,DD,CC,RR,FFF is easily implemented in C # or Java by split, but there is no direct split function in SQL Server. Of course, such problems can always be solved. ALTER function [dbo].

This article introduces the use of substr () string intercepting function in SQL, which is very simple and practical, and can be consulted by students in need. The substr (string, 1, 3) function reads: A string that takes a 3 word length from the

First, review the syntax format of CONVERT (): convert ([length], [, Style]) Second, here pay attention to the meaning of style: style is the conversion of datatime and smalldatetime data to a string by the SQL Server system provided by the

Seen the sixth round of the Black Defense Laboratory Two heroes of the Oblog3.0 Access version of the infiltration process, admiration of the situation like the surging river, and the water as the Yellow River is out of control, especially they put

LINQ---Language integrated Query Generally, when you hear about a query, the first thing you'll think of is a T-SQL statement query database, or an XPath query XML document.And now it is. LINQ provides a common way for you to query the "all" source