The Oracle Wm_concat (column) function is what we often use, and here's how you can use the Oracle Wm_concat (column) function to implement a field merge if you have an Oracle Wm_concat (column) If you are interested in using a function, look at it.
Shopping: -----------------------------------------
U_ID Goods num
------------------------------------------
1 Apple 2
2 Pears 5
1 Watermelon 4
3 Grape 1
3 Banana 1
1 Orange 3
=======================
The results you want are: --------------------------------
u_id Goods_sum
____________________
1 apples, watermelon, oranges
2 Pears
3 Grapes, Banana
---------------------------------
1.select u_id, Wmsys.wm_concat (goods) Goods_sum 2. 3.from Shopping 4. 5.group by u_id
Desired result 2:
--------------------------------
u_id Goods_sum
____________________
1 apples (2 kg), watermelon (4 kg), Orange (3 kg)
2 pears (5 kg)
3 grapes (1 kg), banana (1 kg)
---------------------------------
implemented using the Oracle Wm_concat (column) function: Select u_id, wmsys.wm_concat (Goods | | ' (' | | ' kg ') goods_sum
From shopping
GROUP BY u_id
MySQL---group_concat
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