FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE C JOIN INFORMATION_SCHEMA. TABLES T ON T.TABLE_NAME = C.TABLE_NAME
WHERE C.REFERENCED_TABLE_NAME IS NOT NULL`
sql:=`SELECT DISTINCT C.REFERENCED_TABLE_SCHEMA,C.REFERENCED_TABLE_NAME,C.TABLE_SCHEMA,C.TABLE_NAME,C.CONSTRAINT_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE C JOIN INFORMATION_SCHEMA. TABLES T ON T.TABLE_NAME = C.TABLE_NAME WHERE C.REFERENCED_TABLE_NAME IS NOT NULL`
sql=sql+fmt.Sprintf(` AND C.TABLE_SCHEMA = "%s"`,dbName)
iflen(tbName)>0{
...
...
@@ -548,9 +519,6 @@ WHERE C.REFERENCED_TABLE_NAME IS NOT NULL`