About mssql,

About mssql, I am in a hurry to use the database mssql instead of mysql. I have defined an SQL statement $ SQL and the connection is successful. but why cannot I use mssql_query or mssql_nums_rows? Warning: mssql_query () [function. mssql-query]: Query about mssql, urgent
The database I use is mssql rather than mysql.
I have defined an SQL statement $ SQL
Then the connection is successful.
But why can't mssql_query and mssql_nums_rows be used?

Warning: mssql_query () [function. mssql-query]: Query failed in/opt/coolstack/apache2/htdocs/invoicelog/dealmssql. php on line 113

Warning: mssql_num_rows (): supplied argument is not a valid ms SQL-result resource in/opt/coolstack/apache2/htdocs/invoicelog/dealmssql. php on line 114


------ Solution --------------------
The first error indicates that your query failed.
The second error is associated. if the query fails, the value cannot be set.

Check your SQL commands
------ Solution --------------------
Invalid column name 'bu'
Invalid column name BU does your table have BU fields?