插入 VALUES 和子查詢，postgres

Question

我需要一次插入幾行，並且某些列的值應該取自“VALUES”，而對於某些列，我需要使用子查詢。 假設子查詢將返回與我嘗試插入的行數完全相同的行。 像這樣的東西：

WITH subq AS (
   --returns 3 rows
   SELECT param FROM tbl2 WHERE status = 1  
)
INSERT INTO tbl1 (col1, col2, col3)
VALUES
('col1_val1', 'col2_val1', subq.row1.param),
('col1_val2', 'col2_val2', subq.row2.param),
('col1_val3', 'col2_val3', subq.row3.param)

Answer 1

您可以將文本添加到 CTE 並進行INSERT INTO SELECT

WITH CTE as 
(
(SELECT 'col1_val1', 'col2_val1', param FROM tbl2 WHERE status = 1 ORDER By params LIMIT 1 OFFSET 0)
UNION ALL
(SELECT 'col1_val2', 'col2_val2', param FROM tbl2 WHERE status = 1 ORDER By params LIMIT 1 OFFSET 1)
UNION ALL
(SELECT 'col1_val3', 'col2_val3', param FROM tbl2 WHERE status = 1 ORDER By params LIMIT 1 OFFSET 2))
INSERT INTO tbl1 (col1, col2, col3)
SELECT * FROM CTE