NULL-values

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sql - defaults and null values

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Which of the following is NOT an explicit data type reference?...

NULL-values data-types

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Which of the following KEYWORDS will return the first NON-NULL val...

NULL-values COALESCE

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General Functions

NULL-values General-Functions NVL NV2 NULLIF COALESCE

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NULLIF

NULL-values General-Functions NULLIF

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NVL2

NULL-values General-Functions NV2

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NVL

Oracle NULL-values General-Functions NVL

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What is the difference between a unique key and primary key?...

NULL-values unique-key primary-key constraints

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SQL PRIMARY KEY Constraint

NULL-values unique-key primary-key constraints

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NOT NULL Constraint

NULL-values constraints NOT-NULL-constraint