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Questions and Answers

Meaning of null

Unknown value

Unavailable value

Not applicable attribute

All of the above (correct)

Each individual NULL value considered to be the same from every other NULL value

True

False (correct)

Null = null comparison is acceptable

True

False (correct)

SQL allows queries that check whether an attribute value is null like?

IS NULL Signup and view all the answers

Complete select from where blocks within where clause of another query

nested query Signup and view all the answers

Compares a value with a set or multi set of values, evaluate if the value is one of the elements in the set

In Signup and view all the answers

اذا ابي اطبق شرط على اكثر من اتربيوت اخليهم بقوس ، هذا وش يسمى؟

Tuples of values Signup and view all the answers

فيه مثال بالملخص عقب التيوبلز ارجعي شوفيه

طيب Signup and view all the answers

Any sum and all are used with

Nested queiers Signup and view all the answers

Evaluated once for each tuple in the outer query

Corrlated nested query Signup and view all the answers

Queries with IN or = can be collabsed into one single block

True Signup and view all the answers

Check whether the results of a corrleated nested query is empty or not

Exists Signup and view all the answers

Natural/ outer are types of

Join Signup and view all the answers

نوع من الجوين يشترط الجوين كوندشن (تحط الاتربيوتس الي لازم يتساوون) ومايشترط تشابه اسماء الاتربيوتس

Inner join Signup and view all the answers

Natural join :

A&B Signup and view all the answers