Mysql queries the content of rows that are not repeated, the number of records that are not repeated count, distinct

Source: Internet
Author: User

Mysql queries non-duplicated row content and the number of non-Repeated Records count. distinct has such a table that records id, p_id, p_name, p_content, p_time 1 343 aaa aaaaaa 2012-09-01 2 344 bbb bbbbbb 2012-09-02 3 321 ccc cccccccc 2012-09-03 4 343 aaa aaaaaa 2012-09-04 want to query the content of non-repeated rows, and output p_sum (number of product p_id repetitions) select *, count (*) as p_sum from p_table_name group by p_name; query the total number of rows that do not repeat (easy to write) select count (distinct p_id) as num from p_table_name;

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