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Spark SQL - DDl, DML, DRL. Contribute to UdayKiran0911/SparkSQL development by creating an account on GitHub.
This article explains the use and difference of delete, truncate and drop statements of mysql.1. delete : delete command is used to delete all or specific records from mysql table. the records delete ...
DELETE comes under DML(Data Manipulation Language). DELETE can be used to delete a particular row by using WHERE clause. It is slower than TRUNCATE as it keeps logs. Rollback is possible when used ...
TRUNCATE keyword removes all records from a table while keeping the table's structure and attributes. It essentially functions like a DELETE statement without a WHERE clause. When it is used, ...
I've worked on several large SQL systems and while I've seen plenty of foreign key constraints in use I've never actually seen them do anything besides cause problems during dataloads and ad-hoc ...
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