Question

我有以下SQL尝试使用子查询插入financial_history_details表，因为我需要语句从表的其他部分提取数据。

如果有一行信息，这是可以的。我的问题是我试图插入数千行数据，从不同的表中提取某些信息（batch_number, contact_number）。

我考虑过使用子语句，如本声明中所示，但我已经说过它不能很好地工作，因为它一次只插入一个数据。

INSERT INTO financial_history (batch_number, transaction_number, contact_number, transaction_date, 
            transaction_type, amount, payment_method, posted, address_number, currency_amount) 
VALUES ((select batch_number from event_bookings where batch_number not in (select batch_number from batches)), 1,
(select contact_number from event_bookings where batch_number not in (select batch_number from batches)),
'20-sep-2017', 'P', 0, 'CASH', '20-sep-2017', 
(select address_number from event_bookings where batch_number not in (select batch_number from batches)), 0) ;

我也尝试过使用CSV导入，但这会导致许多问题，使其成为不切实际的解决方案：

BULK
INSERT batches
FROM 'C:\batches.csv'
WITH
(
FIELDTERMINATOR = ',',
ROWTERMINATOR = '\n'
)
GO

还有其他方法吗？

Answer 1

您似乎想要insert . . . select：

insert into financial_history (batch_number, transaction_number, contact_number, transaction_date, 
            transaction_type, amount, payment_method, posted, address_number, currency_amount) 
    select . . .
    from event_bookings
    where batch_number not in (select batch_number from batches);

目前还不清楚您希望列的值是什么。

Answer 2

您可以使用单个SELECT并避免重复多次访问同一个表（您也可以使用SELECT而不使用insert来检查输出）

INSERT INTO financial_history (batch_number, transaction_number, contact_number, transaction_date, 
            transaction_type, amount, payment_method, posted, address_number, currency_amount) 
SELECT batch_number, 1, contact_number, '20-sep-2017', 'P', 0, 'CASH', '20-sep-2017', address_number from event_bookings
WHERE batch_number not in (select batch_number from batches);

提示：

将CONVERT用于日期，不依赖于隐式转换（假设您的目标列是datetime数据类型：例如。 CONVERT（datetime，'20 / 09/2017'，103）106））< / LI>

同一查询的更易读的形式：

INSERT INTO financial_history (batch_number, transaction_number, contact_number, transaction_date, 
            transaction_type, amount, payment_method, posted, address_number, currency_amount) 
SELECT batch_number
  , 1 AS TRANSACTION_NUMBER
  , contact_number
  , '20-sep-2017' AS TRANSACTION_DATE
  , 'P' AS TRANSACTION TYPE
  , 0 AS AMOUNT
  , 'CASH' AS PAYMENT_METHOD
  , '20-sep-2017' AS POSTED
  , address_number 
  FROM event_bookings
  WHERE batch_number not in (select batch_number from batches);

子查询在插入中返回多个结果

2 个答案: