what is function in sql

GUID (Global unique identifier) is a globally unique identifier, which consists of the ID numbers on the NIC (each Nic has a unique ID number) and a 16-byte binary value generated by the unique number of the CPU clock. The GUID format is "XXXXXXXX-

Group by is often used in SQL statements, but it is not very familiar with it, so record it as follows: Select a, cout (*) quantity from table_name group by; The use of group by has a principle, that is, all columns after select do not use aggregate

0 or 100 (*) Default Value: Mon dd yyyy hh: miam (or pm)1 101 us mm/DD/YYYY2 102 ANSI yy. Mm. dd3 103 UK/French dd/mm/yy4 104 German dd. mm. yy5 105 Italian DD-mm-yy6 106-dd mon YY7 107-mon DD, YY8 108-hh: mm: SS-9 or 109 (*) Default Value +

What do you do if you want to analyze data in the database at a specific time? For example, what measures do you take if you want to analyze the data at pm? The most frequently used method is to create a scheduled task, perform a backup at, and back

Introduction to criteria in hibernate:To operate the database management system, the most basic thing is to use SQL (standard query language) statements. Most databases support standard SQL statements, however, there are also some database-specific

----------------------------------------------- Begin --------------------------------------------- Title: Enterprise Library Time: 11:00:00 | Introduction: Patterns & Practices Enterprise Library is a library designed to help developers deal with

The aggregate conversion function is similar to the aggregate function in SQL statements. It applies the column value and copies the result as a new column to the conversion output. Aggregate conversion supports the following operations

A very powerful date Formatting Function in SQL Server Select convert (varchar (100), getdate (), 0): 05 16 2006 AMSelect convert (varchar (100), getdate (), 1): 05/16/06Select convert (varchar (100), getdate (), 2): 06.05.16Select convert (varchar (

Reprinted: A very powerful date Formatting Function in SQL ServerSelect convert (varchar (100), getdate (), 0): 05 16 2006 AMSelect convert (varchar (100), getdate (), 1): 05/16/06Select convert (varchar (100), getdate (), 2): 06.05.16Select

  Added support for CLR in SQL Server 2005, which allows us to write functions, stored procedures, triggers, and other objects for SQL Server in C # and VB. NET languages. There is not much to say about how to create these objects. There are many

Row_number()A function is a newly added function in SQL 2005. It is usually used in paging SQL statements. Microsoft's official description of this function is: return the serial number of an expert in the result Set Partition. The first row of

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

A very powerful date Formatting Function in SQL Server Select convert (varchar (100), getdate (), 0): 05 16 2006 AM Select convert (varchar (100), getdate (), 1): 05/16/06 Select convert (varchar (100), getdate (), 2): 06.05.16 Select convert

GUID (Global unique identifier) is a globally unique identifier, which consists of the ID numbers on the NIC (each Nic has a unique ID number) and a 16-byte binary value generated by the unique number of the CPU clock. The GUID format is "XXXXXXXX-

A very powerful date Formatting Function in SQL Server Select convert (varchar (100), getdate (), 0): 05 16 2006 AMSelect convert (varchar (100), getdate (), 1): 05/16/06Select convert (varchar (100), getdate (), 2): 06.05.16Select convert (varchar

1. Export and import data to a database in SQL Server 1. Select the database to be transferred in the SQL Server Enterprise Manager, right-click and choose all tasks> back up the database. 2. Select database for backup-complete, Target backup to

Function:Returns part of a character, binary, text, or image expression. Syntax:Substring (expression, start, length) The substring function in SQL is used to capture part of a column. The function names are not exactly the same in different

Solution Overview: 1. Change the file name during file storage 2. Configure the Indexing Server and associate the Indexing Server with the ms SQL Server. 3. Modify the SQL statement and add the content of the full-text query statement to the query

Today, I finally made a summary of Chapter 4 of Mr Yan jianling's SQL Server. This chapter focuses on the design basis of SQL Server, I felt like I had known each other and found that many of the knowledge in it was similar to that in VB. First look

The TRIM function in SQL is used to remove the character header or end of a string. The most common purpose is to remove the leading or trailing blank spaces. This function has different names in different databases: MySQL: trim (), rtrim (), ltrim (