Rename Column Syntax Sometimes we want to change the name of a column.
To do this in SQL, we specify that we want to change the structure of the table using the ALTER TABLE command, followed by a command that tells the relational database that we want to rename the column.
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you should ensure that the join produces at most one output row for each row to be modified.
Because of this indeterminacy, referencing other tables only within sub-selects is safer, though often harder to read and slower than using a join.
Attempt to insert a new stock item along with the quantity of stock.
You can use multiple UPDATE statements, each with a different expression.
However, each UPDATE statement can have only one WHERE clause.