How to: Create Full-Text Search Queries (Visual Database Tools)
Full-text searches use the CONTAINS predicate to locate rows that have specified text in a given column. Full-Text searches are only possible on columns that have active full-text indexes. If you attempt to use the CONTAINS clause on a column that does not have a currently active full-text index, you will receive an error. For more information on full-text indexes and the CONTAINS clause, see Full-Text Search Concepts and CONTAINS (Transact-SQL).