mysql - 从另一个表插入 INTO MySQL

Question

INSERT INTO campaign_ledger (`campaign_id`, `description`, amount, balance, timestamp)
VALUES (SELECT id as campaign_id, 'Ported from campaigns' as description, budget_remaining as amount, budget_remaining as balance, NOW() as timestamp FROM campaigns)

这是我的语法，但我收到一条错误消息：

您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以获取正确的语法，以便在第 2 行的“SELECT id as campaign_id、“Ported from campaign”作为描述、budget_remaini 附近使用

我究竟做错了什么？

Answer 1

由于您是从表中选择，因此您将需要使用INSERT INTO SELECT FROM查询：

INSERT INTO campaign_ledger 
(
    `campaign_id`
    , `description`
    , amount
    , balance
    , timestamp
)
SELECT 
    id as campaign_id
    , 'Ported from campaigns' as description
    , budget_remaining as amount 
    , budget_remaining as balance
    , NOW() as timestamp 
FROM campaigns

仅INSERT INTO VALUES在您使用特定值而不是从表中选择时使用。如果您想使用，INSERT INTO VALUES那么您的查询将是这样的：

INSERT INTO campaign_ledger 
(
    `campaign_id`
    , `description`
    , amount
    , balance
    , timestamp
)
VALUES
(
    1
    , 'test'
    , 100.00
    , 1000.00
    , NOW()
)

Answer 2

INSERT INTO campaign_ledger (`campaign_id`, `description`, amount, balance, timestamp)
SELECT id as campaign_id, 'Ported from campaigns' as description,
budget_remaining as amount,budget_remaining as balance,
NOW() as timestamp FROM campaigns;

Answer 3

查询的VALUES部分不是必需的。例如：

 INSERT INTO campaign_ledger (`campaign_id`, `description`, amount, balance, timestamp)
 SELECT id as campaign_id, 'Ported from campaigns' as description, 
        budget_remaining as amount, budget_remaining as balance, 
        NOW() as timestamp 
 FROM campaigns;