SQL is one of the main and mandatory required skills for a Data Scientist. The data scientist needs SQL language knowledge to understand the relational databases and for exploratory data analysis for replacing missing values, finding outliers. SQL also helps to manipulate data by filtering, sorting, using aggregations.
SQL can be combined with SQLite, MySQLdb, and other programming languages like Python to complete the task effectively. SQL can manage high volumes of relational databases and can retrieve, update, alter just by simple queries.
If you want to learn SQL, check out this SQL Certification Course by Intellipaat.
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