WGU D191 - Advanced Data Management (SQL) || Questions & Answers (Rated A+)
WGU D191 - Advanced Data Management (SQL) || Questions & Answers (Rated A+)
to combine Rows from tables based on a match condition - ANSWER - primary purpose of a JOIN is:
returns a single value (scalar) or Row set t...
, WGU D191 - Advanced Data
Management (SQL) || Questions &
Answers (Rated A+)
to combine Rows from tables based on a match condition - ANSWER - primary
purpose of a JOIN is:
returns a single value (scalar) or Row set that is immediately available for use in the
Outer query - ANSWER - A subquery:
Returns a distinct list of Rows from both tables. like a Logical OR would do... -
ANSWER - UNION operator
Returns ALL Rows from Both tables (including duplicate Rows) - ANSWER - UNION
ALL operator
Returns a distinct (non repeating) list (of Rows) of 2 or more sets where the result
appears in both tables/queries/sets. Like a logical AND would do... - ANSWER -
INTERSECT operator
returns ALL rows (including duplicates) from 2 or more tables only where
records/Rows appear in both tables/queries/sets - ANSWER - INTERSECT ALL
operator
Returns a distinct (non repeating) list of Rows that Only appear in the Left
Query/Table/Top result set. works like the Oracle MINUS set operator - ANSWER -
EXCEPT operator
Returns a list of Rows and duplicate Rows that Only appear in the Left Table/Query -
ANSWER - EXCEPT ALL operator
keyword that includes/shows duplicate rows - ANSWER - ALL
Eliminates all duplicate records and fetches only unique records.... keyword used
after set operator to specify duplicate Rows should Not be included - which is also
the default behavior - ANSWER - DISTINCT
establish temporary tables by using the WITH clause - ANSWER - Common Table
Expressions
Returns every possible combination of rows from the first table and the second table
- ANSWER - cross join
Returns only the records that have matching values in the joined field of two tables -
ANSWER - inner join
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