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  2. Cardinality (SQL statements) - Wikipedia

    en.wikipedia.org/wiki/Cardinality_(SQL_statements)

    The lower the cardinality, the more duplicated elements in a column. Thus, a column with the lowest possible cardinality would have the same value for every row. SQL databases use cardinality to help determine the optimal query plan for a given query. [1]

  3. Comma-separated values - Wikipedia

    en.wikipedia.org/wiki/Comma-separated_values

    Comma-separated values (CSV) is a text file format that uses commas to separate values, and newlines to separate records. A CSV file stores tabular data (numbers and text) in plain text, where each line of the file typically represents one data record. Each record consists of the same number of fields, and these are separated by commas in the ...

  4. Comma - Wikipedia

    en.wikipedia.org/wiki/Comma

    This sentence is a bit different; however, a comma is necessary as well. Using commas to offset certain adverbs is optional, including then, so, yet, instead, and too (meaning also). So, that's it for this rule. or; So that's it for this rule. A comma would be appropriate in this sentence, too. or; A comma would be appropriate in this sentence too.