【SQL笔记】SQL

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一、查询年份2016~2018连续年份，left join其他表【oracle】
SELECT REGEXP_SUBSTR(‘2016,2017,2018’, ‘[^,]+’, 1, ROWNUM) YEAR FROM DUAL CONNECT
BY ROWNUM <= regexp_count(‘2016,2017,2018’, ‘,’) + 1

SELECT NUM.ID year
FROM (SELECT ROWNUM ID FROM DUAL CONNECT BY ROWNUM <= 3000) NUM
WHERE NUM.ID BETWEEN 2016 AND 2018