영어에서 The primary key 을 사용하는 예와 한국어로 번역
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Now go to the Company Cars table and make sure the primary key is selected.
You can change the primary key at any time, but each table can have only one primary key. .
Of course, if you don't care about fetching the primary key after an object is inserted,
When creating a table, the primary key of the table must be specified in addition to the table name.
I am using SQL Server 2005 Express Edition and have several tables where the primary key is an identity column.
combination of columns, that is not the primary key.
To obtain the latest data for those rows, an application can use the primary key column values to join the source table with the tracked table.
If you try to delete a row in a primary key table, the delete will fail when the primary key value corresponds to a value in the foreign key constraint of another table.
In a foreign key reference, a link is created between two tables when the column or columns that hold the primary key value for one table are referenced by the column or columns in another table.
when the primary key is EmployeeID,
The PRIMARY KEY constraint has no identifier.
ADD COLUMN statement, the PRIMARY KEY or NOT NULL constraint was violated as all values of the added columns became NULL.
Now we must ensure that the primary keys of related rows in the PERSON and EMPLOYEE tables are equal!
UUIDField is used for the id field to set it as the primary_key for this model.
more than one column, values may be duplicated within one column, but each combination of values from all the columns in the PRIMARY KEY constraint definition must be unique.
The Primary Key.
The Primary Key should be fed into the hash algorithm.
Both these two things are the primary key for that table.