还有一个叫DUAL的public synonym,所以任意的用户都可以访问到DUAL了。 神奇的是,DUAL这货在实例是nomount的状态下也可以访问: [oracle@bogon~]$ sqlplus/assysdbaSQL*Plus:Release12.1.0.2.0ProductiononWedDec1008:00:152014Copyright (c)1982,2014, Oracle.Allrights reserved. Connectedtoan idle instance.SQL>sta...
SELECTUPPER('This is a string')FROMwhat_table;Code language:SQL (Structured Query Language)(sql) In this case, you might think about creating a table and use it in theFROMclause for just using theUPPER()function. Fortunately, Oracle provides you with theDUALtable which is a special table ...
Now, this is only Oracle-specific. If you’ve used SQL Server or MySQL, you don’t need to specify a DUAL table. What Columns Can I Select? I mentioned earlier that the DUAL table is a dummy table used for functions and calculations in your queries. Normally, when you run a SELECT ...
dual是一个表,有一个名为DUMMY,类型为VARCHAR2(1)。DUMMY这个词在英文中的含义为“something designed to resemble and serve as a substitute for the real...
Oracle EU Sovereign Cloud, available since June 2023, is located entirely within the European Union, supported by EU-based personnel, and operated by separate legal entities incorporated within the EU. In addition to the more than 100 cloud services already offered, Oracle applications, such as th...
What is the purpose of CEIL/CEILING? What is the purpose of ABS function? What is SOUNDEX function? Wht is Dual Table in Oracle? Explain DBCC EXTENTINFO Explain briefly about RowLevel Compression Why column Store Index are suitable for large data warehouses? What is the benefit of...
The most common strong authentication policy is dual-factor authentication. When logging in to the system, a user needs to provide not only the user name and password, but also the items bound to the user name and password (for example, USB keys are widely used in online banking), or ...
The most common strong authentication policy is dual-factor authentication. When logging in to the system, a user needs to provide not only the user name and password, but also the items bound to the user name and password (for example, USB keys are widely used in online banking), or ...
What is Oracle doing to support Arm server-side development? Arm,Ampere, and leading ISVs such as GitLab and Jenkins are partnering with Oracle to make Arm server-side development easy and cost effective. Oracle Cloud Infrastructure (OCI), in collaboration with partners, provides an easy path ...
Here is the creation DDL for the well-known table SCOTT.EMP as generated in Oracle Database 11g release 2. SQL> select dbms_metadata.get_ddl('TABLE','EMP','SCOTT') from dual; CREATE TABLE "SCOTT"."EMP" ( "EMPNO" NUMBER(4,0) NOT NULL ENABLE, "ENAME" VARCHAR2(10), ...