How can I count distinct values of all columns in SQL?

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Elaborating on his answer, for MS SQL: select replace(replace(' count(distinct([col])) as [col],', '[tab]', table_name ), '[col]', column_name ) from information_schema. columns where table_name = 'your_table'; Copy the results and paste them in a new query window between. 6 окт. 2017 г.

Does SQL distinct apply to all columns?

Yes, DISTINCT works on all combinations of column values for all columns in the SELECT clause.

How do I count the number of unique columns?

The COUNT DISTINCT function returns the number of unique values in the column or expression, as the following example shows. SELECT COUNT (DISTINCT item_num) FROM items; If the COUNT DISTINCT function encounters NULL values, it ignores them unless every value in the specified column is NULL.

How do I count distinct values in SQL Server?

COUNT(DISTINCT expression) evaluates expression for each row in a group, and returns the number of unique, nonnull values. For return values exceeding 2^31-1, COUNT returns an error. For these cases, use COUNT_BIG instead. COUNT is a deterministic function when used without the OVER and ORDER BY clauses.

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