what is function in sql

Convert a date format using the CONVERT function in SQL Server2008-01-23 15:47 Convert date format with convert function in SQL Server 2008-01-15 convert date format with convert function in 15:51sqlserverThe default date field for the

Convert a date format using the CONVERT function in SQL Server2008-01-23 15:47Convert date format with convert function in SQL Server 2008-01-15 convert date format with convert function in 15:51sqlserverThe default date field for the Chinese

Analysis of the json function in SQL server2016, server2016json Test the basic structure and construct a json format from the query results. Create table t1 (ID int identity, name nvarchar (50), Chinese int, Math int) insert into t1 values ('zhang

Convert date format with convert function in SQL Server 2008-01-15 convert date format with convert function in 15:51sqlserverThe default date field for the Chinese version of SQL Server datetime format is YYYY-MM-DD Thh:mm:ss.mmmFor example:Select

Over cannot be used alone, with analytic functions: Rank (), Dense_rank (), Row_number (), and so on.Its parameters: Over (partition by columnname1 ORDER by Columnname2)Meaning: Group by the field specified by Columname1, or by the value of field

Convert date format with convert function in SQL Server 2008-01-15 convert date format with convert function in 15:51sqlserverThe default date field for the Chinese version of SQL Server datetime format is YYYY-MM-DD Thh:mm:ss.mmmFor example:Select

Sum is the standard SUM function in an SQL statement, and the SUM function returns null if there are no records that match the criteria.But in most cases, we want it to return 0 instead of NULL if the condition record is not met, so we can use the

Sum is the standard SUM function in an SQL statement, and the SUM function returns null if there are no records that match the criteria.But in most cases, we want it to return 0 instead of NULL if the condition record is not met, so we can use the

After converting an ACC database to MS-SQL today, it is found that the replace statement is used: The data type ntext of parameter 1 of the replace function in SQL is invalid. After searching for half a day, I found the solution: Because ntext

Summary of several methods for implementing the SPLIT function in SQL (required), sqlsplit Example 1 The Code is as follows: Create function f_split (@ SourceSql varchar (8000), @ StrSeprate varchar (10) returns @ temp table (a varchar (100) --

Syntax for the decode () function:1 Select decode (ColumnName, value 1, translation value 1, value 2, translation value 2,... Value n, translation value n, default value)23 from talbename45Where ...Where: ColumnName is the column defined in the

CONVERT (varchar (ten), date, 23)1 02/22/06 CONVERT (varchar (), date, 1) 0 Feb 2006 4:26pm CONVERT (CHAR), Current_timestamp, 0) 1 02/22/06 CONVERT (CHAR (8), Current_timestamp, 1) 2

The window function, like an aggregate function, is an aggregate calculation of the set of rows. It is used to define a window for a row (where the window refers to the collection of rows to be manipulated), which operates on a set of values, does

Introduction to the Decode () function:Main role: Translation of query results into other values (that is, in other forms of expression, the following examples);How to use:Select decode (ColumnName, value 1, translation value 1, value 2, translation

One, SQL Server time Date function detailed1. Current system date, timeSelect GETDATE ()2. DateAdd returns a new datetime value based on adding a period of time to the specified dateExample: Add 2 days to the dateSelect DATEADD (day,2, ' 2004-10-15 '

Syntax : object_id (' [database_name. [Schema_name]. | Schema_name. ] object_name ' [, ' object_type '])Parameters : '  object_name ' The object to use. The data type of the object_name is varchar or nvarchar.

First, the syntax:CAST (expression as data_type)Parameter description:expression: Any valid Sqserver expression.as: Used to separate two parameters, before as is the data to be processed, after as is the type of data to be converted.data_type: The

A. Ranking rows in a partitionThe following example ranks the products in the list of specified inventory locations by quantity.  locationid and logically ordered by Quantity . " > result set Press  locationid  partition and logically press

Stored ProceduresStored Procedures (Stored Procedure) are in a large database system, a set of SQL statements to complete a specific function, stored in the database, after the first compilation after the call does not need to compile again, The

The cast function is used to explicitly convert an expression of a data type to another data type. The argument to the CAST () function is an expression that includes the source value and the target data type separated by the AS keyword. Syntax:CAST