如何在查询中将数据插入没有 ID 的表中？

Question

I would like to know how use insert command in query without knowing the Id my table consists of Id ||Dollars || UserName and my table name is creds

I've tried doing insert commands but i cant figure it out

I would just like to know how to get Id without knowing how many columns there are so say there are 3 columns but I dont know that how can I make a new column.

ID is Primary Key

INSERT INTO creds VALUES(Id, 50, 'UserName')

Answer 1

You should always list the columns when doing an insert :

INSERT INTO creds (dollars, username)
     VALUES (50, 'UserName');

If you want to list the id column, use DEFAULT :

INSERT INTO creds (id, dollars, username)
     VALUES (DEFAULT, 50, 'UserName');

Answer 2

For insert actually, you don't need to know the Id

INSERT INTO creds (Id, Dollars, Username) VALUES(50, 2000, 'UserName')

If Id is Identity then you must not include it in the insert:

INSERT INTO creds (Dollars, Username) VALUES(2000, 'UserName')

You would need Id (probably primary key) only if you are updating table:

Update creds set username = 'New Username' where Id = 50

Answer 3

If "Id" column(field)" is auto-incrementable , "Id" and the value are not needed for "INSERT" query :

                -- Don't need "Id" and the value
INSERT INTO creds (Dollars, Username) VALUES(2000, 'UserName')

If "Id" column(field)" is not auto-incrementable , "Id" and the value are needed for "INSERT" query :

                -- Here                       -- Here
INSERT INTO creds (Id, Dollars, Username) VALUES(13, 2000, 'UserName')

Answer 4

It is not a good practice to leave the column name when inserting values in a table. But you can do something like this:

INSERT INTO creds VALUES(
(SELECT max(Id)+1 FROM creds), 50, 'UserName')

If Id is an integer primary key.