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In-depth analysis of the nvl function of Orcale and the isnull function of SQL Server, orcalenvl Nvl function of Orcal NVL (Expr1, Expr2) If Expr1 is NULL, the value of Expr2 is returned. Otherwise, the value of Expr1 is returned. If both Expr1 and Expr2 are NULL, NULL is
Oracle's NVL and SQL Server IsNullGrammarISNULL (Check_expression, Replacement_value) ParametersCheck_expressionAn expression that will be checked for null. Check_expression can be of any type.Replacement_valueThe expression that will be returned when check_expression is null. Replacement_value must have the same type as check_expresssion.return typeReturns the
The NVL function of orcalNVL (EXPR1,EXPR2) If EXPR1 is null, returns the value of EXPR2, otherwise returns the value of EXPR1, EXPR1,EXPR2 null returns null nvl2 (EXPR1,EXPR2,EXPR3) If EXPR1 is null, Returns the value of EXPR2, otherwise returns the value of EXPR3 nullif (EXPR1,EXPR2) If the values of EXPR1 and EXPR2 are equal, returns NULL, Otherwise returns the value of Expr1 coalesce (Expr1, EXPR2, Expr3 ..... EXPRN) represents a placehol
Tags: server serve highlight STS Val begin value Return obj If exists (select * from sys.objects where object_id = object_id (n ' dbo.nvl ') and type = N ' FN ' ) Begin Drop function [dbo].[ nvl];endgocreate function Dbo.nvl (@check_value sql_variant, @replace_value sql_variant) returns SQL_ Variantasbegin return IsNull (@check_value, @replace_value); Endgoselect dbo.
Label:Recently, the company is doing Oracle database related products, here to summarize: ISNULL () function GrammarISNULL (Check_expression, Replacement_value)ParametersCheck_expressionAn expression that will be checked for null. Check_expression can be of any type.Replacement_valueThe expression that will be returned when check_expression is null. Replacement_value must have the same type as check_expresssion.return typeReturns the same type as check_expression.NotesIf Check_expression is not
SQL statement DECODE () and NVL () function usage SELECT DECODE (WP01.ONDO _ KBN, 0 ,'?? For example, when '1, 'normal temperature ', 2, and 'cold recovery') AS ONDO_KBNFROM WP01_S_HAITOTAL WP01 // analysis: When WP01.ONDO _ KBN = 0 "?? When WP01.ONDO _ KBN = 1, assign "Normal Temperature" to "Normal Temperature". When WP01.ONDO _ KBN = 2, assign "cold recovery" to NVL
SQL ISNULL (), NVL (), ifnull () and coalesce () functions, which are often used in our SQL statements, let's take a look at the example tutorial. p_id ProductName UnitPrice UnitsInStock UnitsOnOrder1 Jarlsberg 10.45 16 152 Mascarpone 32.56 233 Gorgonzola 15.67 9 20 Suppose that the "UnitsOnOrder" column is optional and may contain null values. We have the fo
Tags: format SQL font EXE system BEGIN keyword Query Support indexOracle's NVL function NVL () function Returns a non-null value from two expressions. Grammar NVL (EExpression1, EExpression2)Parameters EExpression1, EExpression2 If the eExpression1 evaluates to a null value, NVL
Tags: data types date dates Conversions har bspnvlmisround NVL function is a null-value conversion function one, NVL (expression 1, expression 2) If expression 1 is a null value, NVL returns the value of expression 2, otherwise returns the value of expression 1. The purpose of this function is to convert a null value (NULL) into an actual value. T
Tags: data type example | | ISS does not convert to red SQL MISA NVL function is a null-value conversion functionNVL (expression 1, expression 2)If expression 1 is a null value, NVL returns the value of expression 2, otherwise returns the value of expression 1. The purpose of this function is to convert a null value (NULL) into an actual value. The value of its e
Tags: null SQL optimizationsToday optimizing a piece of SQL, the original script is roughly as follows:Select a. field n from Tab_a a where a. Field 2 is not null;A. Field 2 is indexed, but the query is very slow.So the following changes were made:Select a. field n from Tab_a a where nvl (A. Field 2, ' 0 ')! = ' 0 ';The speed increase is obvious.What is the r
---- Set a non-primary key to clustered index [Step 4] to: http://king123654789.iteye.com/blog/1169191 1. View All indexes. Clustered indexes are created on the primary key by default.Sp_helpindex person 2. -- delete the primary key constraint and remove the index constraint on the primary key queried in [1], for example, PK _ person _ 117F9D94. Remove the primary key constraint from the primary key field. This field is not the primary key.Alter table person drop constraint PK _ person _ 117F9
Platform Description: Two SQL SERVER2005 servers with two identical databases installed on top of each otherRecently, because of the project needs, you need to copy the database on one of the servers on a database on another server, after a lot of Google has finally finished, here to do a detailed record, hoping to help everyone and themselves.One, the first step: SQL
Tags: Audit SQL ServerIntroductionAudit is a feature after SQL Server 2008 that tells you "who did what when?" Specifically, auditing an instance of the SQL Server database engine or a separate database involves tracking and documenting events that occur in the database engi
Introduction Audit is a feature after SQL Server 2008 that tells you "who did what when?" Specifically, auditing an instance of the SQL Server database engine or a separate database involves tracking and documenting events that occur in the database engine. Its bottom-level is based on extended events (Extented event),
Connect to the SQL server lock mechanism (I)-Overview (lock type and scope) Ii. Complete lock compatibility matrix (see) Correct Code Description: see. III. The following table lists the resources that can be locked by the database engine. Name Resources Abbreviations Encoding Specifies the method to describe the resource when a lock is presented. Description Data row
If you establish a connection server with a 32-bit database server on a 64-bit computer and use the connection server for Distributed queries on 64-bit computers, the following error message is returned: Server: Message 7399 , Level 16 , Status 1 , Line 1 Ole db Provider ' Sqloledb ' Reported an
Label:An error occurred while establishing a connection to the server. When you connect to SQL Server 2005, SQL Server does not allow remote connections under the default settingsSQL Server se
SQL Server complex SQL logic implementation, SQL Server SQL Logic I. Problems For example, if you already have data in tables a and B, how can you convert it to Table c through SQL stat
Today to query their own installed sqlserver2008 is R2 version, search the next, found that a lot of people query this problem, now recorded as follows, through the version of the command queryAlso understand the older brother SQL Server version of the good, a look is very clear, record 1. View SQL Server 2005/2008 ve
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