ClickHouse左连接

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A左连接B===>S1区域

SELECT 
    date, 
    ts, 
    country, 
    province, 
    city,
    ye_no
FROM
(SELECT 
    date, 
    ts, 
    country, 
    province, 
    city,
    0 AS yes_no
FROM DBa.tba 
WHERE (date = today()-1) 
)
ALL LEFT JOIN 
(SELECT 
    date, 
    ts, 
    country, 
    province, 
    city
FROM DBb.tbb  
WHERE (date = today()-1)
) USING ( date, ts, country, province, city)