如何在for循环中插入数据

Question

我需要在表中插入多个值。每个查询都会更改一个值。我有这样的INSERT：

INSERT INTO myTable (id, a) Values((select nextval('seq_myTable'), 'A' + index + '_x'

其中“ a”是字符串，而“ index”应在每个循环中更改。 我知道我应该在postgressql的某个循环内执行此操作。

Answer 1

无需进行循环。您可以简单地使用generate_series

knayak=# select nextval('seq_myTable'), 'A' || index || '_x' as s 
 FROM generate_series(1,10) as index;
 nextval | s
---------+----------
       1 | A1_x
       2 | A2_x
       3 | A3_x
       4 | A4_x
       5 | A5_x
       6 | A6_x
       7 | A7_x
       8 | A8_x
       9 | A9_x
      10 | A10_x
(10 rows)

插入声明

INSERT INTO myTable (id, a) select nextval('seq_myTable') as id, 
 'A' || index || '_x' as a 
FROM generate_series(1,10) as index;