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ClickHouse/docs/en/sql-reference/statements/exists.md
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Avoid short syntax
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45 EXISTS

EXISTS Statement

EXISTS [TEMPORARY] [TABLE|DICTIONARY] [db.]name [INTO OUTFILE filename] [FORMAT format]

Returns a single UInt8-type column, which contains the single value 0 if the table or database does not exist, or 1 if the table exists in the specified database.