How can I do this MySQL Statements all in one? - mysql

Question

I have a table with stocks and its prices. Moreover, I have all Rates in this table. Now I would like to get all MArketCAP in USD (= column MarketCap * FXRATE) for all stocks. The original MarketCAP column is in local currency. So I have to multiply by the latest rates.
To get the latetest rates I did following:
Table example:
DROP TABLE IF EXISTS `aktien`;
CREATE TABLE `aktien` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`dummyfield` varchar(255) DEFAULT NULL,
`Company` varchar(255) DEFAULT NULL,
`Stock_Short` varchar(50) DEFAULT NULL,
`country` varchar(10) DEFAULT 'US',
`LastPrice` decimal(17,3) DEFAULT NULL,
`PrevClose` decimal(17,3) DEFAULT NULL,
`PercChange` varchar(50) DEFAULT NULL,
`DayLow` decimal(17,3) DEFAULT NULL,
`DayHigh` decimal(17,3) DEFAULT NULL,
`Dividend` decimal(17,3) DEFAULT '0.000',
`ExDATE` datetime DEFAULT NULL,
`ImportDATE` datetime DEFAULT NULL,
`TradeDate` date DEFAULT NULL,
`refTradeDate` datetime DEFAULT NULL,
`timed` time DEFAULT NULL,
`Open` decimal(17,3) DEFAULT '0.000',
`AfterHrsChange` varchar(200) DEFAULT NULL,
`Volume` bigint(20) DEFAULT '0',
`AskSize` int(17) DEFAULT '0',
`BidSize` int(17) DEFAULT '0',
`AvgDayVol` bigint(20) DEFAULT '0',
`50DMA` decimal(17,3) DEFAULT '0.000',
`200DMA` decimal(17,3) DEFAULT '0.000',
`52WeekHigh` decimal(17,3) DEFAULT '0.000',
`52WeekLow` decimal(17,3) DEFAULT '0.000',
`52WeekRange` varchar(200) DEFAULT NULL,
`MarketCap` varchar(200) DEFAULT NULL,
`EPS` decimal(17,3) DEFAULT '0.000',
`BV` decimal(17,3) DEFAULT '0.000',
`EBITDA` varchar(200) DEFAULT NULL,
`P2S` decimal(17,3) DEFAULT '0.000',
`P2B` decimal(17,3) DEFAULT '0.000',
`PE` decimal(17,3) DEFAULT '0.000',
`Revenue` varchar(200) DEFAULT NULL,
`Mean10LastPrice` decimal(17,3) DEFAULT '0.000',
`Mean20LastPrice` decimal(17,3) DEFAULT '0.000',
`Mean50LastPrice` decimal(17,3) DEFAULT '0.000',
`Mean100LastPrice` decimal(17,3) DEFAULT '0.000',
`Mean200LastPrice` decimal(17,3) DEFAULT '0.000',
`NewHigh` int(1) DEFAULT '0',
`NewLow` int(1) DEFAULT '0',
`stocktype` varchar(50) DEFAULT 'stock',
`NormLastPrice` decimal(17,3) DEFAULT NULL,
`trendcode` int(1) DEFAULT '0',
`Todayflag` int(1) DEFAULT '0',
`KGVC` decimal(17,3) DEFAULT NULL,
`KGVN` decimal(17,3) DEFAULT NULL,
`ShortRatio` decimal(17,3) DEFAULT NULL,
`EPSC` decimal(17,3) DEFAULT NULL,
`EPSN` decimal(17,3) DEFAULT NULL,
`Target1Y` decimal(17,3) DEFAULT NULL,
`AdjClose` decimal(17,3) DEFAULT NULL,
`DMANote` varchar(60) DEFAULT '',
PRIMARY KEY (`id`),
UNIQUE KEY `Stock_Short` (`Stock_Short`,`TradeDate`)
) ENGINE=InnoDB AUTO_INCREMENT=1594308 DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = #saved_cs_client */;
--
-- Dumping data for table `aktien_stack`
--
LOCK TABLES `aktien` WRITE;
/*!40000 ALTER TABLE `aktien_stack` DISABLE KEYS */;
INSERT INTO `aktien` VALUES (1592307,NULL,'LUFTHANSA AG VNA
`O.N','LHA.DE','DE',25.110,24.290,'0.033758733',24.150,25.340,0.800,
'2018-05-09 00:00:00','2018-05-11 20:01:06',
'2018-05-11',NULL,NULL,24.270,NULL,4681038,1900800,948200,3320935,
25.694,27.756,31.260,16.095,NULL,'11862591488',0.000,0.000,
'5404000256',0.333,0.000,4.990,'35650998272',
24.739,25.517,26.056,27.511,26.004,0,0,'stock',
NULL,0,0,0.333,NULL,NULL,NULL,NULL,NULL,NULL,''),
(1592660,NULL,'EUR/USD','EURUSD=X','US',1.194,1.192,'0.0020306304',
1.190,1.197,NULL,NULL,'2018-05-11 23:00:03',
'2018-05-11',NULL,NULL,1.192,NULL,0,0,0,0,1.223,
1.209,1.256,1.086,NULL,NULL,0.000,0.000,NULL,NULL,
0.000,NULL,NULL,0.000,0.000,0.000,0.000,0.000,0,0,
'cur',NULL,0,0,NULL,NULL,NULL,NULL,NULL,NULL,NULL,'')
/*!40000 ALTER TABLE `aktien_stack` ENABLE KEYS */;
UNLOCK TABLES;
How can I do the multiplication of all MarketCap by the FXRATE of all stocks (consider that LocalCurrencyCountry = country) in one statement?
I have done this way: ( I think it might be done with a temp table, right?)
drop table if exists rr;
create TEMPORARY TABLE rr
SELECT s.Stock_Short,
s.country,
rate.country as LocalCurrencyCountry,
s.PrevClose as FXRATE, TradeDate from
(select *,max(id) as maxid from aktien GROUP BY
TradeDate,Stock_short order by id desc) s
join rate on s.Stock_Short = rate.`code` where s.id = maxid
group by LocalCurrencyCountry order by TradeDate desc;
SELECT aktien.MarketCap * FXRATE ,rr.fxrate, Marketcap,
aktien.stock_short from aktien join rr on aktien.country =
rr.localcurrencyCountry group by aktien.country;

Answer 1

Here is my attempt at solving this, it contains 3 (!) sub-queries so its not pretty but maybe someone can optimise this.
The first sub-query is for selecting the "fx-rate" row for each country, the second one is for excluding the same "fx-rate" rows from the final result and the third one is to only include the latest market cap value
SELECT stock_short, marketCap * FX.rate, FX.country
FROM aktien a,
(SELECT PrevClose as rate, a3.country
FROM aktien a3 JOIN rate r ON a3.stock = r.code
ORDER BY tradeDate desc LIMIT 1) as FX
WHERE NOT EXISTS (SELECT * FROM rate WHERE code = a.stock)
AND tradeDate = (SELECT MAX(tradeDate) FROM aktien a2 WHERE a2.stock = a.stock)

Answer 2

You would need to do a select and a sub select. The subselect would select the key and MAX(TradeDate) grouped by the key. The outer select would join from that back to the tables on the trade date allowing you get the latest rate for each.
Generic example where the primary key is id, date. If you want specific to your tables please provide more information.
SELECT z.id, z.maxDate, t.rate
FROM (
SELECT id, MAX(date) AS maxDate
FROM table
GROUP BY id
) z
JOIN table t ON z.id=t.id AND z.maxDate=t.date