Querying data on SQL Tables | Retrieve | Filter | Sort | Group
In SQL, you can use various statements to retrieve, filter, sort, and group data from tables. Here is a brief overview of how to use these statements: #sqldeveloper #filter #sort #group #sqldba #sqlprogramming #sqlservertutorial #codewithavtansh Retrieve data: To retrieve data from a table, you can use the SELECT statement. Here is an example of a basic SELECT statement: SELECT * FROM table_name; This statement retrieves all columns and rows from the specified table. You can also specify specific columns to retrieve by listing them after the SELECT keyword. Filter data: To filter data based on certain conditions, you can use the WHERE clause in conjunction with the SELECT statement. Here is an example of a SELECT statement with a WHERE clause: SELECT * FROM table_name WHERE column_name = 'value'; This statement retrieves all rows where the specified column equals the specified value. Sort data: To sort data in ascending or descending order based on a column, you can use the ORDER BY clause in conjunction with the SELECT statement. Here is an example of a SELECT statement with an ORDER BY clause: SELECT * FROM table_name ORDER BY column_name DESC; This statement retrieves all rows from the specified table and sorts them in descending order based on the specified column. You can use the ASC keyword to sort in ascending order. Group data: To group data based on a column and apply aggregate functions, such as SUM, AVG, COUNT, MAX, and MIN, you can use the GROUP BY clause in conjunction with the SELECT statement. Here is an example of a SELECT statement with a GROUP BY clause: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name; This statement groups the rows in the specified table based on the specified column and applies the COUNT function to each group. The result is a summary of the number of rows in each group. In conclusion, SQL provides various statements and clauses that allow you to retrieve, filter, sort, and group data from tables. By using these statements effectively, you can extract meaningful insights from your data and make informed decisions.
In SQL, you can use various statements to retrieve, filter, sort, and group data from tables. Here is a brief overview of how to use these statements: #sqldeveloper #filter #sort #group #sqldba #sqlprogramming #sqlservertutorial #codewithavtansh Retrieve data: To retrieve data from a table, you can use the SELECT statement. Here is an example of a basic SELECT statement: SELECT * FROM table_name; This statement retrieves all columns and rows from the specified table. You can also specify specific columns to retrieve by listing them after the SELECT keyword. Filter data: To filter data based on certain conditions, you can use the WHERE clause in conjunction with the SELECT statement. Here is an example of a SELECT statement with a WHERE clause: SELECT * FROM table_name WHERE column_name = 'value'; This statement retrieves all rows where the specified column equals the specified value. Sort data: To sort data in ascending or descending order based on a column, you can use the ORDER BY clause in conjunction with the SELECT statement. Here is an example of a SELECT statement with an ORDER BY clause: SELECT * FROM table_name ORDER BY column_name DESC; This statement retrieves all rows from the specified table and sorts them in descending order based on the specified column. You can use the ASC keyword to sort in ascending order. Group data: To group data based on a column and apply aggregate functions, such as SUM, AVG, COUNT, MAX, and MIN, you can use the GROUP BY clause in conjunction with the SELECT statement. Here is an example of a SELECT statement with a GROUP BY clause: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name; This statement groups the rows in the specified table based on the specified column and applies the COUNT function to each group. The result is a summary of the number of rows in each group. In conclusion, SQL provides various statements and clauses that allow you to retrieve, filter, sort, and group data from tables. By using these statements effectively, you can extract meaningful insights from your data and make informed decisions.