Mysql 两个SQL表，但在一个表中显示数据

以下两个表应合并为1，仅显示市场、买入日期计数和卖出日期计数：

SELECT Market, macdb.Date_buy 
FROM Buy_orders_macd macdb 
JOIN SECTOR sec ON sec.Ticker = macdb.Name_buy 
WHERE macdb.Date_buy = '2020-02-18' 


SELECT Market, macds.Date_sell 
FROM Sell_orders_macd macds 
JOIN SECTOR sec ON sec.Ticker = macds.Name_sell 
WHERE macds.Date_sell = '2020-02-18'

此处的示例输出为：

Market    Count of Date_buy    Count of Date_sell
Market_1       3                     4
Market_2       2                     2

我该怎么做呢？我试过结合，但不是那样的。

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我拥有的其他一些数据是Company Name

将这两个查询与

UNION

结合起来，并使用

SUM（）

对每个查询中的行进行计数，按市场进行分组

SELECT Market, SUM(buy) AS `Count of Date_buy`, SUM(sell) AS `Count of Date_sell`
FROM (
    SELECT Market, 1 AS buy, 0 AS sell
    FROM Buy_orders_macd macdb 
    JOIN SECTOR sec ON sec.Ticker = macdb.Name_buy 
    WHERE macdb.Date_buy = '2020-02-18'
    UNION ALL
    SELECT Market, 0 AS buy, 1 AS sell
    FROM Sell_orders_macd macds
    JOIN SECTOR sec ON sec.Ticker = macds.Name_sell
    WHERE macds.Date_sell = '2020-02-18'
) AS x
GROUP BY Market

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不确定如何在第二个查询之后添加查询。你能举个例子吗？这看起来很正确，谢谢！