To select data from a table in SQL, you can use the SELECT statement. Here is an example of how to select all columns and rows from a table named “employees”: SQL – Select Query
SELECT * FROM employees;
This will return all columns and all rows from the “employees” table.
You can also specify which columns you want to select:
SELECT name, age FROM employees;
You can also filter the rows that are returned using a WHERE clause:
SELECT * FROM employees WHERE age > 30;
This will return all columns for all rows where the “age” column is greater than 30.
You can also sort the rows that are returned using an ORDER BY clause:
SELECT * FROM employees ORDER BY salary DESC;
This will return all columns for all rows sorted by the “salary” column in descending order.
You can also limit the number of rows returned using a LIMIT clause:
SELECT * FROM employees LIMIT 10;
This will return the first 10 rows of the table.
You can also use GROUP BY and HAVING clause to group the rows by specific columns and applying conditions on the groups.
SELECT age, AVG(salary) FROM employees GROUP BY age HAVING AVG(salary) > 40000;
You can also join multiple tables using the JOIN clause to combine data from different tables.
The possibilities are endless, and the SQL query can be very complex depending on the requirement.
Please note that the exact syntax may vary depending on the SQL server you are using.
Also, you have to have appropriate permissions to select data from a table, otherwise you will get an error message.
It’s also important to keep in mind that when you select data from a table, you can also lock the table or the selected rows, which can cause some downtime or interruptions to other applications that rely on the table.
SQL – Select Query SQL – Select Query SQL – Select Query