if statement in select query oracle

The first step: the client sends the statement to the server-side executionWhen we execute a SELECT statement on the client, the client sends the SQL statement to the server side, allowing the server-side process to process the statement. That is,

Sort out the key points of Data Query Optimization in Oracle databases, and query oracle Data The most basic task of a database is to store and manage data. The only database feature that an end user can see is its performance: the speed at which

1.create user username identified by password;//build username and password Oracle 2.grant CONNECT,RESOURCE,DBA to username;//authorize Grant CONNECT,RESOURCE,DBA,SYSDBA to username; 3.connect username/password//Enter. 4.select

create  table [dbo].[ tgongwen]  (     --tgongwen is red-headed table name    [Gid] [int]  identity  (1, 1)   not  null , --The ID number of this table, also the primary key    [ title] [varchar]  ( collate chinese_prc_ci_as ); null ,  

If we now use a SELECT statement to query data from a database, how does the Oracle database work? What can we learn from it? Below, combine a simple SELECT statement to see the operating mechanism of Oracle database backstage. This is very helpful

(Reprinted) If we use the SELECT statement to query data from the database, how does the Oracle database work? What can we learn from this? Next, we will combine a simple SELECT statement to look at the operating mechanism of the Oracle database

Oracle 10g SQL paging query statement and Efficiency Analysis When using the Oracle database for paging query algorithm design, the paging query SQL statements can basically be applied according to the template given below: Paging Query

1.5 How to use an arithmetic expression in an SQL statementYou can use an expression in an SQL statement. There are 4 types of operators that can be used in an expression: +,-,*,/They represent addition, subtraction, multiplication, and division

Here we will introduce more than 40 useful Oracle query statements, covering date operations, server information retrieval, execution status retrieval, database size calculation, and other queries. These are essential skills for all Oracle

Here we will introduce more than 40 useful Oracle query statements, covering date operations, server information retrieval, execution status retrieval, database size calculation, and other queries. These are essential skills for all Oracle