添加SQL数据集-https://help.fanruan.com/finebi/doc-view-890.html
-- SQL数据集支持「关联与合并」操作;
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select * from 雇员
union all
select * from 雇员
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SELECT
*
FROM
(SELECT * FROM 雇员) AS a
LEFT JOIN (SELECT * FROM 雇员) AS b ON a.家庭电话 = b.家庭电话