According toWikipedia, the DUAL table was created by Oracle staff member Chuck Weiss. It was originally used to join internal views: I created the DUAL table as an underlying object in the Oracle Data Dictionary. It was never meant to be seen itself, but instead used inside a view that wa...
1.What is the dual table, what is its purpose. dual is just a convienence table. You don't need to use it, you can use anything you want. The advantage to dual is the optimizer understands dual is a special one row, one column table -- when you use it in queries, it uses thi...
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 ...
efficient thingforme.5) yes6) the optimizer understands dualisa magic, special1row table. It stoppedontheselect* because thereistobe one rowinthere. Its just the way it works. Hopefully you reset dual backto1row after your testingoryou just totally broke your database!7)likeI said, duals ...
Table of Contents: What Is Database Security Database Security Best Practices Effects of Poor Database Security Types of Threats in Database Database Security Testing Database Testing Process Types of Database Security Testing Benefits of Using Database Testing Tool ...
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 ...
SELECT DBMS_SQLTUNE.report_tuning_task('5dkrnbx1z8gcb_tuning_task_1') AS recommendations FROM dual; SET PAGESIZE 24 2. Go through the profile recommendation part of the report: DBMS_SQLTUNE.report_tuning_taskwill generate the completed output of the advisory. If you go through the profile...
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Re: why does "select 1 from dual" work - what is the "1"? Hi,this is all explained in the documentation :"DUAL is a table automatically created by Oracle Database along with the data dictionary. DUAL is in the schema of the user SYS but is accessible...
Route Table refresh routing IP traffic between two NIC's installed in the same server RPC Error 1722: RPC Server Unavailable RPC server is too busy to complete this operation. RPC Server is unavailable requesting a new certificate RPC server is unavailable. Event ID 1219 RPC Server Unavailable ...