diff --git a/dialects/oracle.go b/dialects/oracle.go
index 72c26ce2..b0c5c38f 100644
--- a/dialects/oracle.go
+++ b/dialects/oracle.go
@@ -609,7 +609,7 @@ func (db *oracle) IsReserved(name string) bool {
 }
 
 func (db *oracle) DropTableSQL(tableName string) (string, bool) {
-	return fmt.Sprintf("DROP TABLE `%s`", tableName), false
+	return fmt.Sprintf("DROP TABLE \"%s\"", tableName), false
 }
 
 func (db *oracle) CreateTableSQL(ctx context.Context, queryer core.Queryer, table *schemas.Table, tableName string) (string, bool, error) {
@@ -645,6 +645,10 @@ func (db *oracle) CreateTableSQL(ctx context.Context, queryer core.Queryer, tabl
 	return sql, false, nil
 }
 
+func (db *oracle) IsSequenceExist(ctx context.Context, queryer core.Queryer, seqName string) (bool, error) {
+	return db.HasRecords(queryer, ctx, `SELECT sequence_name FROM user_sequences WHERE sequence_name = :1`, seqName)
+}
+
 func (db *oracle) SetQuotePolicy(quotePolicy QuotePolicy) {
 	switch quotePolicy {
 	case QuotePolicyNone: