mysql 裏怎麼實現full join

mysql如今還不支持full join ，那若是有這種需求怎麼辦呢？能夠用union all來實現mysql 數據源以下sql CREATE TABLE L AS SELECT 'left_1' AS str,'1' AS v FROM dual UNION ALL SELECT 'left_2','2' AS v FROM dual UNION ALL SELECT 'left_3','3'

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