diff --git a/main.go b/main.go
index 710be69..2eba9e8 100644
--- a/main.go
+++ b/main.go
@@ -75,28 +75,13 @@ func _main(databases map[string]database, databasesArgs []string, query string,
 		targetDatabases = append(targetDatabases, k)
 	}
 
-	sqlTypes := map[sqlType]exists{}
-	var sqlType sqlType
-	for _, db := range targetDatabases {
-		database := databases[db]
-		typ, ok := validSQLTypes[database.SQLType]
-		if !ok {
-			usage("Unknown sql type %v for %v", database.SQLType, db)
-		}
-		sqlType = typ
-		sqlTypes[sqlType] = exists{}
-		if len(sqlTypes) > 1 {
-			usage("More than one sql types specified in target databases.")
-		}
-	}
-
 	quitContext, cancel := context.WithCancel(context.Background())
 	go awaitSignal(cancel)
 
 	var wg sync.WaitGroup
 	wg.Add(len(targetDatabases))
 
-	sqlRunner := mustNewSQLRunner(quitContext, sqlType, println, query, len(targetDatabases) > 1)
+	sqlRunner := mustNewSQLRunner(quitContext, println, query, len(targetDatabases) > 1)
 
 	returnCode := 0
 	for _, k := range targetDatabases {
diff --git a/sql_runner.go b/sql_runner.go
index ddeef73..c97cb38 100644
--- a/sql_runner.go
+++ b/sql_runner.go
@@ -17,6 +17,10 @@ const (
 	postgreSQL
 )
 
+func (t sqlType) String() string {
+	return [...]string{"MySQL", "PostgreSQL"}[t]
+}
+
 type exists struct{}
 
 type sqlOptions struct {
@@ -54,16 +58,14 @@ var sqlTypeToOptions = map[sqlType]sqlOptions{
 }
 
 type sqlRunner struct {
-	typ         sqlType
 	printer     func(string)
 	query       string
 	quitContext context.Context
 	multi       bool
 }
 
-func mustNewSQLRunner(quitContext context.Context, typ sqlType, printer func(string), query string, multi bool) *sqlRunner {
+func mustNewSQLRunner(quitContext context.Context, printer func(string), query string, multi bool) *sqlRunner {
 	return &sqlRunner{
-		typ,
 		printer,
 		query,
 		quitContext,
@@ -72,7 +74,12 @@ func mustNewSQLRunner(quitContext context.Context, typ sqlType, printer func(str
 }
 
 func (sr *sqlRunner) runSQL(db database, key string) bool {
-	sqlOptions := sqlTypeToOptions[sr.typ]
+	typ, ok := validSQLTypes[db.SQLType]
+	if !ok {
+		usage("Unknown sql type %v for %v", db.SQLType, db)
+	}
+
+	sqlOptions := sqlTypeToOptions[typ]
 
 	userOption := ""
 	if db.User != "" {
@@ -100,7 +107,7 @@ func (sr *sqlRunner) runSQL(db database, key string) bool {
 	}
 
 	options := ""
-	if sr.typ == postgreSQL {
+	if typ == postgreSQL {
 		options = fmt.Sprintf("%v %v %v %v %v", sqlOptions.cmd, userOption, hostOption, dbOption, sqlOptions.flags)
 	} else {
 		options = fmt.Sprintf("%v %v %v %v %v %v", sqlOptions.cmd, dbOption, userOption, passOption, hostOption, sqlOptions.flags)
@@ -109,7 +116,7 @@ func (sr *sqlRunner) runSQL(db database, key string) bool {
 	var cmd *exec.Cmd
 	if db.AppServer != "" {
 		escapedQuery := fmt.Sprintf(`'%v'`, strings.Replace(sr.query, `'`, `'"'"'`, -1))
-		if sr.typ == postgreSQL {
+		if typ == postgreSQL {
 			escapedQuery += fmt.Sprintf("-F%s", "\t")
 		}
 
@@ -117,13 +124,13 @@ func (sr *sqlRunner) runSQL(db database, key string) bool {
 
 	} else {
 		args := append(trimEmpty(strings.Split(options, " ")), sr.query)
-		if sr.typ == postgreSQL {
+		if typ == postgreSQL {
 			args = append(args, fmt.Sprintf("-F%s", "\t"))
 		}
 		cmd = exec.CommandContext(sr.quitContext, args[0], args[1:]...)
 	}
 
-	if sr.typ == postgreSQL {
+	if typ == postgreSQL {
 		cmd.Env = os.Environ()
 		cmd.Env = append(cmd.Env, passOption)
 	}