"Syntax error near the keyword 'column"

What is the "syntax error near the keyword 'column? It's actually very easy!
On that day, I want to add several fields to a table and write an SQL statement: alter table bus_project add column IsCY int default 0.
Anyone who knows how to run the command will prompt "there is a syntax error near the keyword 'column ". I checked my statements. No error! Then, I searched for information online. Check the alter table syntax! I am depressed. I think the syntax is like this. Why does it report an error?
Finally, no information is found on the Internet. You only need to check the online slave books of SQL Server. Finally online on SQL Server Books The answer is "COLUMN", probably because the SQL version is different and the statement rules are different. Change to "alter table name ALTER field name type.