How to count number of rows in sql?

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4 answer(s)
Answer # 1 #

Tip: COUNT(column_name) only counts non-NULL values in that column, while COUNT(*) counts all rows.

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Answer # 2 #

If you want to count rows based on a condition: sql SELECT COUNT(*) FROM table_name WHERE column_name = 'value'; This filters rows before counting.

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Answer # 3 #

To count the number of rows in a SQL table, use the COUNT() function. Example: sql SELECT COUNT(*) FROM table_name; This returns the total number of rows.

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Answer # 4 #

For large tables, COUNT(*) can be slow. Some databases support approximate counts or metadata queries for faster results.

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