Question

这是我的问题：

WITH rows AS (INSERT INTO t_patch(f_name)VALUES('KB000')RETURNING f_patch_id)
INSERT INTO t_patch_available (f_patch_id, f_product_id)
SELECT f_patch_id,7 FROM rows;

有效。但是，如果我想要使用相同的t_patch_available插入多个f_patch_id？

，那么语法是什么？

Answer 1

您可以在select上使用union来添加更多行。

WITH rows AS (INSERT INTO t_patch(f_name)VALUES('KB001')RETURNING f_patch_id)
INSERT INTO t_patch_available (f_patch_id, f_product_id) 
SELECT f_patch_id,7 FROM rows 
UNION ALL SELECT f_patch_id, 8 FROM rows

Answer 2

您不希望每行使用一个SELECT，这对于多行来说是不必要的冗长且昂贵的。 CROSS JOIN到一组ID（假设product_id为integer）。

WITH rows AS (INSERT INTO t_patch(f_name) VALUES ('KB000') RETURNING f_patch_id)
INSERT INTO t_patch_available (f_patch_id, f_product_id)
SELECT f_patch_id, product_id
FROM   rows
     , unnest ('{6,8,9,11,345}'::int[]) product_id;  -- set of product_id's

或者您可以使用VALUES表达式：

...
FROM   rows
    , (VALUES (6) ,(8), (9), (11), (345)) AS p(product_id);  -- set of product_id

INSERT多行与RETURNING子句中的ID组合在一起

2 个答案: