What is SELECT from dual in SQL?
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 by the name DUAL to all users. It has one column, DUMMY , defined to be VARCHAR2(1) , and contains one row with a value X . Lees verder »
Bron: docs.oracle.com
What is the use of dual in SQL?
In SQL, "DUAL" is a special one-row, one-column table present in Oracle databases. It is commonly used for evaluating expressions or functions when a table reference is required but not relevant to the operation, providing a placeholder for computations without the need for an actual table. Lees verder »
Bron: www.naukri.com
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