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Database training
1.3.09. Join equivalence
Equivalent to sequence
Cartesian product (X)
followed by Selection (
s
)
ACTUAL_DEPENDENTS =
s
SSN=ESSN
(EMPNAMES X DEPENDENT)
or
ACTUAL_DEPENDENTS =
EMPNAMES ⋈
SSN=ESSN
(DEPENDENT)
‹ 1.3.08. Joins, canonical algebraic form
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1.3.10. Join types (condition) ›
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