Ask questions about installing and configuring ProcessMaker 3
#785972
The obvious answer is 85 (i.e, 100 - 15). However, that is not necessarily correct. Specifically, any records with a customer_id of NULL will not be included in either count (i.e., they won’t be included in cust_123_total, nor will they be included in cust_not_123_total). For example, if exactly one of the 100 customers has a NULL customer_id, the result of the last query will be:
+--------- ----------+
| cust_not_123_total |
+--------------------+
| 84 |
+--------------------+

This can solve your doubt but thorough reference is needed then visit
https://intellipaat.com/tutorial/sql-tutorial/
#828693
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