插入中的行号

Question

我想在其中一列中插入行号。 But since row_number() is a window ( analytic proper to Oracle ) function which can be used only for select statement is there any other way to insert row number.

例如：

INSERT INTO prnr (pm,GEG_ID,ET_ID,fzg_id,nr,id)
VALUES(p_gpm_id,master_rec.geg_id,master_rec.et_id,
       master_rec.fzg_id,row_number() over (partition by master_rec.geg_id));

我想在程序中使用这个插入语句。

Answer 1

尝试将您的代码重构为INSERT INTO... SELECT ：

INSERT INTO prnr (pm, GEG_ID, ET_ID, fzg_id, nr, id)
SELECT p_gpm_id, geg_id, et_id, fzg_id, ROW_NUMBER() OVER (PARTITION BY geg_id),
       -- some 6th column here...
FROM master_rec;

Answer 2

如果您的目标只是简单地为id列生成顺序 integer 值（如注释中所述），则使用GENERATED ALWAYS AS IDENTITY选项重新创建现有id列，例如

ALTER TABLE prnr DROP COLUMN id;
ALTER TABLE prnr ADD id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY;