SQL SELECT Query

aggregation and table relationships using GROUP BY， we will demonstrate how to retrieve specific columns from the Customer table. Here we will fetch only FirstName and LastName for each record. Query: SELECT FirstName， COUNT(*) AS customer_count FROM Customer GROUP BY Country; Output: Example 5: SELECT with DISTINCT Clause In this example， on which we use the SELECT query. Customer Table Query: SELECT CustomerID， filter customers who are 21 years old. Query: SELECT FirstName FROM Customer WHERE Age = 21; Output: Example 4: SELECT with GROUP BY Clause In this example， we will use SELECT Statement with LIMIT clause Query: SELECT * FROM Customers LIMIT 3; ， we will use SELECT statement with GROUP BY Clause to group rows and perform aggregation. Here， we will fetch unique countries from the Customer table. Query: SELECT DISTINCT Country FROM Customer; Output: Example 6: SELECT Statement with HAVING Clause The HAVING clause is used to filter results after applying GROUP BY. In this example， we will find countries that have 2 or more customers in the Customer table. Query: SELECT Country， we  create  a demo SQL table， we will fetch all the fields from table Customer: Query: SELECT * FROM Customer; Output: Example 3: SELECT Statement with WHERE Clause Suppose we want to see table values with specific conditions then WHERE Clause is used with select statement. In this example， we will use SELECT Statement with ORDER BY clause. Here， FirstName FROM Customer; Output: Syntax: SELECT column1， The SQL SELECT statement is used to retrieve data from one or more tables and display it in a structured format of rows and columns. Fetches all columns using * or specific columns by name. Filters and sorts data using WHERE and ORDER BY. Supports grouping， column2: columns you want to retrieve. table_name: name of the table you're querying. Working with the SELECT Statement The SELECT statement is used to retrieve and display data from one or more tables in a structured and readable format. Example 1: Select Specific Columns In this example， COUNT(*) AS customer_count FROM Customer GROUP BY Country HAVING COUNT(*) = 2; Output: Example 7: SELECT Statement with ORDER BY clause In this example， Sort results by Age in descending order. Query: SELECT * FROM Customer ORDER BY Age DESC; Output: Example 8: SELECT Statement with LIMIT clause In this example， we will use DISTINCT keyword to return only unique values from a column. Here， HAVING and JOIN. Example:  First， we will count the number of customers from each country. Query: SELECT Country， LastName FROM Customer; Output: Example 2: Select All Columns In this example，column2.... FROM table_name; column1，。