PostgreSQL String() Function: Join a particular text with a column
5. Write a query to join the text '@example.com' with the email column.
Sample Output :
EMAIL -------------------- [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] - - - - - - - - - - - - - - - - - - - - - -
Sample Solution:
Code:
-- This SQL statement updates the email addresses of employees by appending '@example.com' to their existing email addresses.
UPDATE employees -- Specifies the table to be updated, in this case, the employees table
SET email = CONCAT(email, '@example.com'); -- Updates the email column by concatenating the existing email addresses with '@example.com'
Explanation:
- This SQL statement updates the email addresses of employees by appending '@example.com' to their existing email addresses.
- The UPDATE statement modifies existing records in the specified table.
- The employees table is specified as the table to be updated.
- The SET clause indicates the column(s) to be updated and the new value(s) to be assigned.
- The email column of the employees table is updated by concatenating the existing email addresses with the string '@example.com'.
- The CONCAT() function is used to concatenate the existing email addresses with the string '@example.com'.
- After execution, each employee's email address will be updated to include '@example.com' at the end.
Sample table: employees
Output:
postgres=# UPDATE employees SET email = postgres-# CONCAT(email, '@example.com'); UPDATE 107
Here is the command to see the updated result:
postgres=# SELECT * from emp; employee_id | first_name | last_name | email | phone_number | -------------+-------------+-------------+---------------------------+--------------------+- 100 | Steven | King | [email protected] | 515.123.4567 | 101 | Neena | Kochhar | [email protected] | 515.123.4568 | 102 | Lex | De Haan | [email protected] | 515.123.4569 | 103 | Alexander | Hunold | [email protected] | 590.423.4567 | 104 | Bruce | Ernst | [email protected] | 590.423.4568 | 105 | David | Austin | [email protected] | 590.423.4569 | 106 | Valli | Pataballa | [email protected] | 590.423.4560 | 107 | Diana | Lorentz | [email protected] | 590.423.5567 | 114 | Den | Raphaely | [email protected] | 515.127.4561 | 115 | Alexander | Khoo | [email protected] | 515.127.4562 | 116 | Shelli | Baida | [email protected] | 515.127.4563 | 117 | Sigal | Tobias | [email protected] | 515.127.4564 | 118 | Guy | Himuro | [email protected] | 515.127.4565 | 119 | Karen | Colmenares | [email protected] | 515.127.4566 | 120 | Matthew | Weiss | [email protected] | 650.123.1234 | ...
N.B.: A few columns have been displayed as a sample result.
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