Discover select 1 from dual oracle, include the articles, news, trends, analysis and practical advice about select 1 from dual oracle on alibabacloud.com
Basically, Oracle introduced dual as a syntax-compliant1. We start with the name, dual is not an abbreviation, itself is the complete word. Dual noun means logarithm, when doing adjectives refers to two heavy, two yuan.2. The dual table in Oracle is
1. Use of DUAL tables
Dual is an existing table in Oracle that can be read by any user. It is often used in Select statement blocks without a target table-view the current connected user
SQL> select user from dual;
USER
------------------------------
Oracle Dual table details
1. Use of DUAL tablesDual is an existing table in Oracle that can be read by any user. It is often used in Select statement blocks without a target table.-- View the current connected userSQL> select user from dual;USER-----
Oracle the dual table in the detailed1,DUALpurpose of the tableDual is a physically existing table in Oracle that can be read by any user, often in a SELECT statement block without a target table--View current connected userSql> Select User from
1, the use of dual tableDual is a physically existing table in Oracle that can be read by any user, often in a SELECT statement block without a target table--View current connected userConnected to Oracle Database 10g Enterprise Edition Release 10.1.
1, the use of dual table
Dual is an actual table in Oracle that can be read by any user and is often used in a SELECT statement block that does not have a target table
(1) View current connected users
Sql> Select User from dual;
USER
-----------
Recently, Oracle encountered a special table dual. I think oracle users have a special liking for dual. As a result, I found some posts on the Internet and thought it would be better to post them here for everyone to learn.
Dual is a virtual table
Dual is a virtual table used to form the select syntax rule. oracle ensures that there will always be only one record in dual. We can use it to do a lot of things, as shown below: view the current
Dual is a virtual table used to form the select
Dual is a virtual table used to form the select syntax rule. Oracle ensures that there will always be only one record in dual. We can use it to do a lot of things, as shown below:
1. view the current user. You can execute the following statement
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