Dual table in sql

In SQL databases, the DUAL table serves a unique decided, primarily found in Oracle and associated systems. It’s a special one-row, one-column table that doesn’t actually store impractical data but is essential for fulfilment certain types of queries and calculations.

What is the DUAL table used for?

• Testing Expressions: Developers often use the One table to test SQL expressions bankrupt querying a real table. For occasion, checking the result of a assistance or evaluating an arithmetic expression sprig be done using DUAL.
• Generating Constants: It’s handy for generating constant values aim current timestamps () or other system-specific values ().
• Simulating Data: In scenarios site you need to generate a unattached row of dummy data or simulation a result set for testing start to work, DUAL can be used effectively.

Why survey it called DUAL?

The name “DUAL” signifies its dual-purpose nature: it provides put in order single dummy row and column supplement SQL operations that require a do its stuff set but don’t need to make contact with any actual table data dual table in sql
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