Question

需要有关此sql命令的帮助。

表：

category ( category, id_category, salary, year)
oldcategory ( year, category, salary )

我如何获取oldcategory上的数据并将其插入到类别中，同时为id_category上的每个不同类别创建一个数字ID？

INSERT INTO category(category, id_category, salary, year)
SELECT DISTINCT category, () , salary, year
FROM oldcategory
WHERE category IS NOT NULL AND salary IS NOT NULL AND year IS NOT NULL

Answer 1

按类别的字母顺序考虑序列号的相关计数聚合：

INSERT INTO category(category, id_category, salary, year)
SELECT DISTINCT 
       category, 
       (SELECT Count(*) FROM 
                        (SELECT DISTINCT deepsub.category
                         FROM oldcategory deepsub) sub
        WHERE sub.category <= oldcategory.category) AS id_category, 
       salary, year
FROM oldcategory
WHERE category IS NOT NULL 
  AND salary IS NOT NULL 
  AND year IS NOT NULL

Answer 2

INSERT INTO CATEGORY(CATEGORY, ID_CATEGORY, SALARY, YEAR)
SELECT DISTINCT A.CATEGORY,DENSE_RANK() OVER(ORDER BY A.CATEGORY) AS ID_CATEGORY,
A.SALARY,A.YEAR FROM OLDCATEGORY AS A
WHERE A.CATEGORY IS NOT NULL AND A.SALARY IS NOT NULL AND A.YEAR IS NOT NULL
ORDER BY A.YEAR

从另一个表插入

2 个答案: