[英]count items for each category sql php
using sql and php. 使用sql和php。
I have the following table schema 我有以下表格架构
id | item_id | category_id
I've sample data in this table 我在此表中有示例数据
id | item_id | category_id 1 | 1525 | shoes 2 | 2565 | shoes 3 | 2558 | shirts 4 | 2885 | shirts 5 | 3545 | shirts 6 | 1885 | belts
Requirement: I need to count how many items are in each category, and echo the count and item_ids 要求:我需要计算每个类别中有多少个项目,并回显count和item_ids
for example "category shoes has 2 items - 1525,2565" I need to do this for all categories. 例如“类别鞋有2个项目-1525,2565”,我需要针对所有类别执行此操作。
SELECT category_id, COUNT(*) as num_items, GROUP_CONCAT(item_id) AS items
FROM YourTable
GROUP BY category_id
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