练习1 将三张表中的TICKER_SYMBOL为600383和600048的 信息合并在⼀起。
SELECT MarketData.*,OperatingData.INDIC_NAME_EN,
OperatingData.VALUE,IncomeStatement.N_INCOME,
IncomeStatement.T_COGS,IncomeStatement.T_REVENUE
FROM
(
SELECT TICKER_SYMBOL,END_DATE,CLOSE_PRICE
FROM 'Market Data'
WHERE TICKER_SYMBOL IN ('600383','600048')
)MarketData
LEFT JOIN
(
SELECT TICKER_SYMBOL,INDIC_NAME_EN,END_DATE,VALUE
FROM 'company operating'
WHERE TICKER_SYMBOL IN ('600383','600048')
) OperatingData
ON MarketData.TICKER_SYMBOL = OperatingData.TICKER_SYMBOL
AND MarketData.END_DATE = OperatingData.END_DATE
LEFT JOIN
(
SELECT DISTINCT TICKER_SYMBOL,END_DATE,T_REVENUE,T_COGS,N_INCOME
FROM 'income statement'
WHERE TICKER_SYMBOL IN ('600383','600048')
) IncomeStatement
ON MarketData.TICKER_SYMBOL = IncomeStatement.TICKER_SYMBOL
AND MarketData.END_DATE = IncomeStatement.END_DATE
ORDER BY MarketData.TICKER_SYMBOL, MarketData.END_DATE
练习2 找出 pH=3.03的所有红葡萄酒，然后，对其 citric acid 进⾏中式排名（相同排名的下⼀个名次应该是下⼀个连续的整数值。换句话说，名次之间不应该有“间隔”）
SELECT PH,'citric acid',DENSE_RANK() OVER(ORDER BY 'citric acid') AS rank
FROM 'winequality-red'
WHERE PH = 3.03
练习3 试分别找出在2016年7⽉期间，发放优惠券总⾦额最多和发放优惠券张数最多的商家。
SELECT Merchant_id,
SUM(SUBSTRING_INDEX('Discount_rate',':',-1)) AS discount_amount
FROM ccf_offline_stage1_test_revised
WHERE Date_received BETWEEN '2016-07-01' AND '2016-07-31'
GROUP BY Merchant_id
ORDER BY discount_amont desc
LIMIT 1
SELECT Merchant_id,COUNT(1) AS cnt
FROM ccf_offline_stage1_test_revised
WHERE Date_received BETWEEN '2016-07-01' AND '2016-07-31'
GROUP BY Merchant_id
ORDER BY cnt DESC
LIMIT 1;
练习4 在2015年⽤电最⾼峰是发⽣在哪⽉？并且相⽐去年同期增⻓/减少了多少个百分⽐
-- 2015年⽤电最⾼峰是发⽣在哪⽉
SELECT PERIOD_DATE,MAX(DATA_VALUE) FianlValue
FROM 'macro industry'
WHERE INDIC_ID = '2020101522' AND YEAR(PERIOD_DATE) = 2015
GROUP BY PERIOD_DATE
ORDER BY FianlValue DESC
LIMIT 1;
-- 并且相⽐去年同期增⻓/减少了多少个百分⽐？
SELECT BaseData.*,(BaseData.FianlValue - YoY.FianlValue) / YoY.FianlValue YoY
FROM
(
SELECT PERIOD_DATE,MAX(DATA_VALUE) FianlValue
FROM `macro industry`
WHERE INDIC_ID = '2020101522' AND YEAR(PERIOD_DATE) = 2015
GROUP BY PERIOD_DATE
ORDER BY FianlValue DESC
LIMIT 1
)BaseData
LEFT JOIN
(
SELECT PERIOD_DATE,MAX(DATA_VALUE) FianlValue
FROM `macro industry`
WHERE INDIC_ID = '2020101522' AND YEAR(PERIOD_DATE) = 2014
GROUP BY PERIOD_DATE
) YoY
ON YEAR(BaseData.PERIOD_DATE) = YEAR(YoY.PERIOD_DATE) + 1
AND MONTH(BaseData.PERIOD_DATE) = MONTH(YoY.PERIOD_DATE);
练习5 试统计在2016年6⽉间，线上总体优惠券弃⽤率为多少？并找出优惠券弃⽤率最⾼的商家
-- 2016年6⽉期间，线上总体优惠券弃⽤率为多少？
SELECT
SUM(CASE WHEN Date='0000-00-00' AND Coupon_id IS NOT NULL THEN 1 ELSE 0 END) /
SUM(CASE WHEN Coupon_id IS NOT NULL THEN 1 ELSE 0 END) AS discard_rate
FROM ccf_online_stage1_train
WHERE Date_received BETWEEN '2016-06-01' AND '2016-06-30';
-- 2016年6⽉期间，优惠券弃⽤率最⾼的商家？
SELECT Merchant_id,
SUM(CASE WHEN Date='0000-00-00' AND Coupon_id IS NOT NULL THEN 1 ELSE 0 END) /
SUM(CASE WHEN Coupon_id IS NOT NULL THEN 1 ELSE 0 END) AS discard_rate
FROM ccf_online_stage1_train
WHERE Date_received BETWEEN '2016-06-01' AND '2016-06-30'
GROUP BY Merchant_id
ORDER BY discard_rate DESC
LIMIT 1;
练习6 找出 pH=3.63的所有⽩葡萄酒，然后，对其 residual sugar 量进⾏英式排名（⾮连续的排名）
SELECT pH,'residual sugar',RANK() OVER (ORDER BY 'residual sugar') AS rankn
FROM 'winequality-white'
WHERE pH= 3.63;
练习7 计算截⽌到2018年底，市值最⼤的三个⾏业是哪些？以及这三个⾏业⾥市值最⼤的三个公司是哪些？
-- 计算截⽌到2018年底，市值最⼤的三个⾏业是哪些？
SELECT TYPE_NAME_CN,SUM(MARKET_VALUE)
FROM 'market data'
WHERE YEAR(END_DATE) <= 2018
GROUP BY TYPE_NAME_CN
ORDER BY SUM(MARKET_VALUE) DESC
LIMIT 3
-- 这三个⾏业⾥市值最⼤的三个公司是哪些？ 9个
SELECT BaseData.TYPE_NAME_CN,BaseData.TICKER_SYMBOL
FROM
(
SELECT TYPE_NAME_CN,TICKER_SYMBOL,MARKET_VALUE,
ROW_NUMBER() OVER(PARTITION BY TYPE_NAME_CN ORDER BY MARKET_VALUE) CompanyRanking
FROM `market data`
) BaseData
LEFT JOIN
(
SELECT TYPE_NAME_CN,SUM(MARKET_VALUE)
FROM 'market data'
WHERE YEAR(END_DATE) <= 2018
GROUP BY TYPE_NAME_CN
ORDER BY SUM(MARKET_VALUE) DESC
LIMIT 3
) top3Type
ON BaseData.TYPE_NAME_CN = top3Type.TYPE_NAME_CN
WHERE CompanyRanking <= 3 AND top3Type.TYPE_NAME_CN IS NOT NULL
练习8 试找出在2016年6⽉期间，线上线下累计优惠券使⽤次数最多的顾客
SELECT User_id,SUM(couponCount) couponCount
FROM
(
SELECT User_id,count(*) couponCount
FROM 'ccf_online_stage1_train'
WHERE (Date IS NOT NULL AND Coupon_id IS NOT NULL AND YEAR(DATE)=2016)
GROUP BY User_id
UNION ALL
SELECT User_id,COUNT(*) couponCount
FROM 'ccf_offline_stage1_train'
WHERE (Date IS NOT NULL AND Coupon_id IS NOT NULL AND YEAR(DATE)=2016)
GROUP BY User_id
) BaseData
GROUP BY User_id
ORDER BY SUM(couponCount) DESC
LIMIT 1
练习9 按季度统计，⽩云机场旅客吞吐量最⾼的那⼀季度对应的净利润是多少
-- 因为正好是第⼀季度，所以不需要减。 如果是2季度，单季度净利润需要⽤2季度的值减去1⽉份的
SELECT *
FROM
(
SELECT TICKER_SYMBOL,YEAR(END_DATE) Year,QUARTER(END_DATE) QUARTER,SUM(VALUE) Amount
FROM 'company operating'
WHERE INDIC_NAME_EN = 'Baiyun Airport:Passenger throughput'
GROUP BY TICKER_SYMBOL,YEAR(END_DATE),QUARTER(END_DATE)
ORDER BY SUM(VALUE) DESC
LIMIT 1
) BaseData
LEFT JOIN
(
SELECT TICKER_SYMBOL,YEAR(END_DATE) Year,QUARTER(END_DATE) QUARTER,SUM(N_INCOME) Amount
FROM 'income statement'
GROUP BY TICKER_SYMBOL,YEAR(END_DATE),QUARTER(END_DATE)
) Income
ON BaseData.TICKER_SYMBOL = Income.TICKER_SYMBOL
AND BaseData.Year = Income.Year
AND BaseData.QUARTER = Income.QUARTER
练习10 试找出在2016年6⽉期间，线上线下累计被使⽤优惠券满减最多的前3名商家
SELECT Merchant_id, SUM(discount_amount) discount_amount
FROM
(
SELECT Merchant_id,
SUM(SUBSTRING_INDEX('Discount_rate',':',-1)) AS discount_amount
FROM 'ccf_online_stage1_train'
-- WHERE (Date != 'null' AND Coupon_id != 'null') AND (LEFT(DATE,4)=2016) AND MID(DATE,5,2) = '06'
WHERE (Date IS NOT NULL AND Coupon_id IS NOT NULL) AND YEAR(DATE)=2016 AND MONTH(DATE) = '06'
GROUP BY Merchant_id
UNION ALL
SELECT Merchant_id,
SUM(SUBSTRING_INDEX(`Discount_rate`,':',-1)) AS discount_amount
FROM 'ccf_offline_stage1_train'
WHERE (Date IS NOT NULL AND Coupon_id IS NOT NULL) AND YEAR(DATE)=2016 AND MONTH(DATE) = '06'
GROUP BY Merchant_id
) BaseData
GROUP BY Merchant_id
ORDER BY SUM(discount_amount) DESC
LIMIT 1
