Update monthly-transactions-ii.sql

Author: kamyu104

MySQL/monthly-transactions-ii.sql

@@ -3,10 +3,10 @@
 
 SELECT MONTH,
        country,
-       sum(IF(TYPE = "approved", 1, 0)) AS approved_count,
-       sum(IF(TYPE = "approved", amount, 0)) AS approved_amount,
-       sum(IF(TYPE = "chargeback", 1, 0)) AS chargeback_count,
-       sum(IF(TYPE = "chargeback", amount, 0)) AS chargeback_amount
+       sum(IF(TYPE = 'approved', 1, 0)) AS approved_count,
+       sum(IF(TYPE = 'approved', amount, 0)) AS approved_amount,
+       sum(IF(TYPE = 'chargeback', 1, 0)) AS chargeback_count,
+       sum(IF(TYPE = 'chargeback', amount, 0)) AS chargeback_amount
 FROM (
         (SELECT left(t.trans_date, 7) AS MONTH,
                 t.country,