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How to allow NULL value for one column in unique index on multiple columns

Error: the <column-name> is of time without time zone but expression is of type character varying

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PostgreSQL COPY command - how to write query in more than one line

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Detecting cycles in a recursive query

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Extrapolate daily historical values from a table that only records when a value changes (Postgresql 9.3)

How to determine if NULL is contained in an array in Postgres?

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