I'm trying to insert some mock payment info into a dev database with this query:
INSERT
INTO
Payments(Amount)
VALUES(12.33)
WHERE
Payments.CustomerID = '145300';
How can adjust this to execute? I also tried something like this:
IF NOT EXISTS(
SELECT
1
FROM
Payments
WHERE
Payments.CustomerID = '145300'
) INSERT
INTO
Payments(Amount)
VALUES(12.33);
I think you are trying to do an update statement (set amount = 12.33 for customer with ID = 145300)
UPDATE Payments
SET Amount = 12.33
WHERE CustomerID = '145300'
Else if you are trying to insert a new row then you have to use
IF NOT EXISTS(SELECT 1 FROM Payments WHERE CustomerID = '145300')
INSERT INTO Payments(CustomerID,Amount)
VALUES('145300',12.33)
Or if you want to combine both command (if customer exists do update else insert new row)
IF NOT EXISTS(SELECT 1 FROM Payments WHERE CustomerID = '145300')
INSERT INTO Payments(CustomerID,Amount)
VALUES('145300',12.33)
ELSE
UPDATE Payments
SET Amount = 12.33
WHERE CustomerID = '145300'
If you want to insert new rows with the given CustomerID
INSERT
INTO
Payments(Amount,CustomerID )
VALUES(12.33,'145300');
else if you already have payment for the customer you can do:
UPDATE
Payments
SET Amount = 12.33
WHERE
CustomerID = '145300';
It sounds like having the customerID already set. In that case you should use an update statement to update a row. Insert statements will add a completely new row which can not contain a value.
是否要执行更新;
update Payments set Amount = 12.33 where Payments.CustomerID = '145300'
Ok, looks like I actually need to just do an insert into the Payments table that has the correct CustomerID, as there are currently no Payments with that CustomerID, so I cannot update it.
I ran INSERT INTO Payments (CustomerID, Amount, PaymentTypeID) Values ('145300', 24.99, 8);
and then SELECT * FROM Payments WHERE Payments.CustomerID = '145300';
to confirm and we're in business. Thanks everyone!
Better solution and without risk of deadlocks:
UPDATE Payments
SET Amount = 12.33
WHERE CustomerID = '145300'
INSERT INTO Payments(CustomerID,Amount)
SELECT '145300',12.33
WHERE @@ROWCOUNT=0
i do inserts into a table if the record doesn't exist this way. may not be entirely what is after but it may be helpful
insert into x (a,b)
select 1,2
where 0=(select count(*) from x where a = 1 and b = 2)
如果要修改现有行,请尝试如下更新,
UPDATE Payments SET Amount = 12.33 WHERE CustomerID = '145300';
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.