[英]How can I add a field that count the number of the records retrieved by my query? Why am I obtaining this error message?
我不太喜歡SQL，並且在嘗試更改查詢時存在以下疑問（我將MySql作為DB使用）。
所以我有這個查詢：
SELECT
MD.id AS market_id,
MD.market_name AS market_name,
CN.id AS commodity_details_id,
CD.commodity_name_en AS commodity_name_en,
CN.commodity_name AS commodity_name,
CD.image_link AS image_link,
CN.description AS description,
MD_CD.id AS price_serie_id,
MCPS.avg_price AS today_avg_price,
YMCPS.avg_price AS yesterday_avg_price,
CASE WHEN MCPS.market_commodity_details_id IS NOT NULL
THEN
MCPS.currency
ELSE
YMCPS.currency
END AS currency,
CASE WHEN MCPS.market_commodity_details_id IS NOT NULL
THEN
MCPS.measure_unit
ELSE
YMCPS.measure_unit
END AS measure_unit
FROM MarketDetails_CommodityDetails AS MD_CD
INNER JOIN MarketDetails AS MD
ON MD_CD.market_details_id = MD.id
INNER JOIN CommodityDetails as CD
ON MD_CD.commodity_details_id = CD.id
INNER JOIN CommodityName AS CN
ON CD.id=CN.commodity_details_id
LEFT JOIN
(
SELECT
Market_Commodity_Price_Series.id AS price_series_id,
market_commodity_details_id
, avg_price
, CU.ISO_4217_cod AS currency
, MU.unit_name AS measure_unit
FROM Market_Commodity_Price_Series
INNER JOIN MeasureUnit AS MU
ON Market_Commodity_Price_Series.measure_unit_id = MU.id
INNER JOIN Currency AS CU
ON Market_Commodity_Price_Series.currency_id = CU.id
WHERE price_date = CURDATE()
) AS MCPS
ON MD_CD.id = MCPS.market_commodity_details_id
LEFT JOIN
(
SELECT
Market_Commodity_Price_Series.id AS price_series_id,
market_commodity_details_id
, avg_price
, CU.ISO_4217_cod AS currency
, MU.unit_name AS measure_unit
FROM Market_Commodity_Price_Series
INNER JOIN MeasureUnit AS MU
ON Market_Commodity_Price_Series.measure_unit_id = MU.id
INNER JOIN Currency AS CU
ON Market_Commodity_Price_Series.currency_id = CU.id
WHERE price_date = ADDDATE(CURDATE(), -1)
) AS YMCPS
ON MD_CD.id = YMCPS.market_commodity_details_id
WHERE
MD_CD.commodity_details_id = 4
AND
MD.localization_id = 2
這將返回2條類似的記錄，這些記錄代表銷售特定商品的市場，如下所示：
market_id market_name commodity_details_id commodity_name_en commodity_name image_link description price_serie_id today_avg_price yesterday_avg_price currency measure_unit
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
4 Tambacounda Market N1 4 Red onion Red onion https://firebasestorage.googleapis.com/v0/b/blablabla.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fonion-red.png?alt=media&token=4ec9de4e-6e5a-4198-9bcd-21b692760618 Red onion 24 20,15 18,94 XOF kilogram
5 Tambacounda Market N2 4 Red onion Red onion https://firebasestorage.googleapis.com/v0/b/blablabla.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fonion-red.png?alt=media&token=4ec9de4e-6e5a-4198-9bcd-21b692760618 Red onion 28 13,7 16,2 XOF kilogram
好的，我想添加一個新字段，該字段代表可使用該商品的市場數量（基本上是檢索到的記錄的數量），因此我嘗試執行以下操作：
SELECT
MD.id AS market_id,
MD.market_name AS market_name,
count(MD.id) AS market_total_number,
CN.id AS commodity_details_id,
CD.commodity_name_en AS commodity_name_en,
CN.commodity_name AS commodity_name,
CD.image_link AS image_link,
CN.description AS description,
MD_CD.id AS price_serie_id,
MCPS.avg_price AS today_avg_price,
YMCPS.avg_price AS yesterday_avg_price,
CASE WHEN MCPS.market_commodity_details_id IS NOT NULL
THEN
MCPS.currency
ELSE
YMCPS.currency
END AS currency,
CASE WHEN MCPS.market_commodity_details_id IS NOT NULL
THEN
MCPS.measure_unit
ELSE
YMCPS.measure_unit
END AS measure_unit
FROM MarketDetails_CommodityDetails AS MD_CD
INNER JOIN MarketDetails AS MD
ON MD_CD.market_details_id = MD.id
INNER JOIN CommodityDetails as CD
ON MD_CD.commodity_details_id = CD.id
INNER JOIN CommodityName AS CN
ON CD.id=CN.commodity_details_id
LEFT JOIN
(
SELECT
Market_Commodity_Price_Series.id AS price_series_id,
market_commodity_details_id
, avg_price
, CU.ISO_4217_cod AS currency
, MU.unit_name AS measure_unit
FROM Market_Commodity_Price_Series
INNER JOIN MeasureUnit AS MU
ON Market_Commodity_Price_Series.measure_unit_id = MU.id
INNER JOIN Currency AS CU
ON Market_Commodity_Price_Series.currency_id = CU.id
WHERE price_date = CURDATE()
) AS MCPS
ON MD_CD.id = MCPS.market_commodity_details_id
LEFT JOIN
(
SELECT
Market_Commodity_Price_Series.id AS price_series_id,
market_commodity_details_id
, avg_price
, CU.ISO_4217_cod AS currency
, MU.unit_name AS measure_unit
FROM Market_Commodity_Price_Series
INNER JOIN MeasureUnit AS MU
ON Market_Commodity_Price_Series.measure_unit_id = MU.id
INNER JOIN Currency AS CU
ON Market_Commodity_Price_Series.currency_id = CU.id
WHERE price_date = ADDDATE(CURDATE(), -1)
) AS YMCPS
ON MD_CD.id = YMCPS.market_commodity_details_id
WHERE
MD_CD.commodity_details_id = 4
AND
MD.localization_id = 2
我只是將此SELECT添加到檢索字段列表中：
count(MD.id) AS market_total_number,
因為我的想法是對檢索到的記錄進行計數，但是現在執行我的查詢卻收到以下錯誤消息：
#42000In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'digital_services_DB.MD.id'; this is incompatible with sql_mode=only_full_group_by
為什么？ 怎么了？ 我想念什么？ 如何解決此問題並獲得所需的結果？
使用聚合功能時，分組依據是必填項。 嘗試這個
SELECT count(market_id) AS market_total_number,
market_id,
market_name,
market_total_number,
commodity_details_id,
commodity_name_en,
commodity_name,
image_link,
description,
price_serie_id,
today_avg_price,
yesterday_avg_price,
currency ,
measure_units
FROM (
SELECT
MD.id AS market_id,
MD.market_name AS market_name,
count(MD.id) AS market_total_number,
CN.id AS commodity_details_id,
CD.commodity_name_en AS commodity_name_en,
CN.commodity_name AS commodity_name,
CD.image_link AS image_link,
CN.description AS description,
MD_CD.id AS price_serie_id,
MCPS.avg_price AS today_avg_price,
YMCPS.avg_price AS yesterday_avg_price,
CASE WHEN MCPS.market_commodity_details_id IS NOT NULL
THEN
MCPS.currency
ELSE
YMCPS.currency
END AS currency,
CASE WHEN MCPS.market_commodity_details_id IS NOT NULL
THEN
MCPS.measure_unit
ELSE
YMCPS.measure_unit
END AS measure_unit
FROM MarketDetails_CommodityDetails AS MD_CD
INNER JOIN MarketDetails AS MD
ON MD_CD.market_details_id = MD.id
INNER JOIN CommodityDetails as CD
ON MD_CD.commodity_details_id = CD.id
INNER JOIN CommodityName AS CN
ON CD.id=CN.commodity_details_id
LEFT JOIN
(
SELECT
Market_Commodity_Price_Series.id AS price_series_id,
market_commodity_details_id
, avg_price
, CU.ISO_4217_cod AS currency
, MU.unit_name AS measure_unit
FROM Market_Commodity_Price_Series
INNER JOIN MeasureUnit AS MU
ON Market_Commodity_Price_Series.measure_unit_id = MU.id
INNER JOIN Currency AS CU
ON Market_Commodity_Price_Series.currency_id = CU.id
WHERE price_date = CURDATE()
) AS MCPS
ON MD_CD.id = MCPS.market_commodity_details_id
LEFT JOIN
(
SELECT
Market_Commodity_Price_Series.id AS price_series_id,
market_commodity_details_id
, avg_price
, CU.ISO_4217_cod AS currency
, MU.unit_name AS measure_unit
FROM Market_Commodity_Price_Series
INNER JOIN MeasureUnit AS MU
ON Market_Commodity_Price_Series.measure_unit_id = MU.id
INNER JOIN Currency AS CU
ON Market_Commodity_Price_Series.currency_id = CU.id
WHERE price_date = ADDDATE(CURDATE(), -1)
) AS YMCPS
ON MD_CD.id = YMCPS.market_commodity_details_id
WHERE
MD_CD.commodity_details_id = 4
AND
MD.localization_id = 2
) base
group by market_id,
market_name,
market_total_number,
commodity_details_id,
commodity_name_en,
commodity_name,
image_link,
description,
price_serie_id,
today_avg_price,
yesterday_avg_price,
currency ,
measure_units
當您要創建具有諸如count之類的聚合功能的select並檢索任何字段時，必須使用group by。
您可以在以下網址了解更多信息： https : //dev.mysql.com/doc/refman/5.7/en/group-by-functions.html
因此，如果您在查詢末尾添加它，它將起作用。
GROUP BY
MD.id
,MD.market_name
,CN.id
,CD.commodity_name_en
,CN.commodity_name
,CD.image_link
,CN.description
,MD_CD.id
,MCPS.avg_price
,YMCPS.avg_price
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