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NULL-values
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Русский
sql - defaults and null values
NULL-values
Which of the following is NOT an explicit data type reference?...
NULL-values
Which of the following KEYWORDS will return the first NON-NULL val...
NULL-values
General Functions
NULL-values
NULLIF
NULL-values
NVL2
NULL-values
NVL
NULL-values
What is the difference between a unique key and primary key?...
NULL-values
SQL PRIMARY KEY Constraint
NULL-values
NOT NULL Constraint
NULL-values
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