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Series
In this series, you are going to learn SQL from scratch. You will get a topic explanation, syntax, code samples and some tips.
The SELECT statement is used to retrieve data from a database. It is the most commonly used command in SQL and forms the foundation of querying data. The SELECT statement allows users to specify the columns they want to fetch and apply filters, sorti...
The SELECT DISTINCT statement is used to retrieve unique values from a column or combination of columns in a table. It eliminates duplicate rows from the result set. Key Points Removes Duplicate Rows: The DISTINCT keyword ensures that only unique r...
The COUNT function in SQL is used to return the number of rows in a result set. It can count all rows or only those that meet a specific condition. Key Points Counts Rows: The COUNT function calculates the total number of rows in a table or result ...
The WHERE clause in SQL is used to filter records in a query based on specified conditions. It is typically applied in SELECT, UPDATE, DELETE, and other SQL statements to limit the rows affected or returned by the query. Key Points Conditional Filt...
The ORDER BY clause in SQL is used to sort the result set of a query in ascending or descending order based on one or more columns. By default, it sorts in ascending order unless specified otherwise. Key Points Sorts Query Results: The ORDER BY cla...
The LIMIT clause in SQL is used to restrict the number of rows returned by a query. It is especially useful for pagination or when you want to retrieve only a specific subset of the results. Key Points Restricts Result Set Size: The LIMIT clause sp...
