INSERT从选择多行PostgreSQL中

Question

如PostgreSQL的manual描述一个可以在一个INSERT语句添加多行：

INSERT INTO films (code, title, did, date_prod, kind) VALUES 
    ('6717', 'Tampopo', 110, '1985-02-10', 'Comedy'), 
    ('6120', 'The Dinner Game', 140, DEFAULT, 'Comedy'); 

还嵌套SELECT这样的查询工作：

INSERT INTO films (code, title, did, date_prod, kind) 
    SELECT table.code, 'Tampopo', 110, '1985-02-10', 'Comedy' 
    FROM other_table AS table2; 

然而，我似乎无法想出一个办法，在同一时间做两个：

INSERT INTO films (code, title, did, date_prod, kind) 
SELECT 
    (table.code + 100, 'abc', NULL, t2.date_prod, t2.kind), 
    (table.code + 200, 'xyz', NULL, t2.date_prod, t2.kind) 
FROM other_table AS t2; 

如果other_table只包含(61717 | 'Tampopo' | NULL | '1985-02-10' | 'Comedy')，结果表是这样的：

code | title |  did |  date_prod  |  kind 
-------------------------------------------------- 
61817 | 'abc' | NULL | '1985-02-10' | 'Comedy' 
61917 | 'xyz' | NULL | '1985-02-10' | 'Comedy' 

This fiddle应进一步解释......

可否请你指出我的地方，我错了。如果可能，我想避免在other_table AS t2中进行多次查找，因为它是VIEW，并且需要花费相当多的时间来构建。

Answer 1

您可以使用INSERT INTO ... UNION ALL：

INSERT INTO films (code, title, did, date_prod, kind) 
SELECT t2.code + 100, t2.title, t2.did, t2.date_prod, t2.kind 
FROM other_table AS t2 
UNION ALL 
SELECT t2.code + 200, t2.title, t2.did, t2.date_prod, t2.kind 
FROM other_table AS t2; 

Answer 2

一般来说，你可以使用select与union：

insert into films (code, title, did, date_prod, kind) 
    select t2.code + 100, t2.title, NULL::float, t2.date_prod, t2.kind 
    from other_table AS t2 
union 
    select t2.code + 200, t2.title, NULL::float, t2.date_prod, t2.kind 
    from other_table AS t2; 

在您所描述的特定情况下，你可以使用unnest (array [])：

insert into films (code, title, did, date_prod, kind) 
    select 
     unnest(array[t2.code + 100, t2.code + 200]), 
     t2.title, NULL::float, t2.date_prod, t2.kind 
    from other_table AS t2