Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat. The purpose of this eBook is to educate the reader about ransomware attacks.
then the number of results is more than expected (duplicates).
SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id LEFT JOIN table3 ON table2.id=table3.id AND otherid=2000
SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id LEFT JOIN table3 ON table2.id=table3.id WHERE table3.otherid=2000
the number of records is less than expected, because the "otherid=2000" is being applied to all records, not just the ones that are on both table1 and table2.
SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id INNER JOIN table3 ON table2.id=table3.id AND otherid=2000
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