在MySQL

Question

COUNT重複記錄

我需要一個查詢計數重複的記錄，

對於實例

table name -customer 
=================== 

customer_id-col name 
222 
111 
222 
222 
111 
122 

輸出將

customer_id count 

222    3 
111    2 
222    3 
222    3 
111    2 
122    1 

我想這個查詢

SELECT customer_id，count（customer_id）c FROM customer GROUP BY CUSTOMER_ID HAVING C> 1

輸出是

CUSTOMER_ID計數

222    3 
111    2 
122    1 

預先這可能由於

由於 拉加

Answer 1

嘗試此

SELECT T.customer_id,S.duplicate_count FROM 
    (
    SELECT customer_id,count(customer_id) AS duplicate_count 
    FROM yourtable group by customer_id 
    HAVING (duplicate_count > 0) 
    ) AS S Join yourtable On S.customer_id = T.customer_id 

FIDDLE DEMO

OP：

 
customer_id  count 

    222    3 
    111    2 
    222    3 
    222    3 
    111    2 
    122    1 

Answer 2

select customer_id,count(1) as count 
from customer 
group by customer_id