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NULL-values
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Русский
sql - defaults and null values
NULL-values
Which of the following is NOT a data type?
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Which of the following KEYWORDS is used to return the first NON NULL value from a list of columns?
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General Functions
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NULLIF
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NVL2
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NVL
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What is the difference between a unique key and primary key?
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SQL PRIMARY KEY Constraint
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NOT NULL Constraint
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