SELECT count(*) as cnt 
            FROM portal_english.dbo.en_epilogue A 
            INNER JOIN (
                SELECT * FROM (
                    SELECT 
                        idx as lec_no, 
                        pack_name, 
                        '' AS lec_teacher_code1, 
                        '' AS lec_teacher_code2, 
                        '' AS lec_teacher_code3, 
                        pack_yn 
                    FROM portal_english.dbo.en_package
            
                    UNION ALL
            
                    SELECT 
                        lec_no, 
                        lec_name, 
                        lec_teacher_code1,
                        lec_teacher_code2,
                        lec_teacher_code3,
                        'N'
                    FROM portal_english.dbo.en_lecture
                ) AAAA
            ) C 
                ON A.ep_code = C.lec_no
            LEFT OUTER JOIN portal_english.dbo.en_member B 
                ON A.member_id = B.membersq
            WHERE TRY_CONVERT(INT, C.lec_no) IS NOT NULL AND A.co_id IS NULL 

Array
(
    [0] => Array
        (
            [0] => 22018
            [SQLSTATE] => 22018
            [1] => 245
            [code] => 245
            [2] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]varchar 값 '-1 OR 2+725-725-1=0+0+0+1 -- '을(를) 데이터 형식 int(으)로 변환하지 못했습니다.
            [message] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]varchar 값 '-1 OR 2+725-725-1=0+0+0+1 -- '을(를) 데이터 형식 int(으)로 변환하지 못했습니다.
        )

)

1