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A左连接B===>S1区域
1、等价方式一
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)
AND cid != '1sk309'
) USING ( date, ts, country, province, city)
2、等价方式二
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)
) AS A
ALL LEFT JOIN
(SELECT
date,
ts,
country,
province,
city
FROM DBb.tbb
WHERE (date = today()-1)
AND cid != '1sk309'
) AS B
ON ( A.date=B.date, A.ts=B.ts, A.country=B.country, A.province=B.province, A.city=B.city)
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