DO:
This SQL Server AND condition example would return all rows where the first_name in the employees table is 'Sarah'. And the employees and contacts tables are joined on the employee_id from the employees table and the contact_id from the contacts table. You will notice that all of the fields are prefixed with the table names (ie: contacts.last_name). This is required to eliminate any ambiguity as to which field is being referenced; as the same field name can exist in both the employees and the contacts tables.
In this case, the result set would only display the employee_id and last_name fields (as listed in the first part of the SELECT statement.).
SELECT employees.employee_id, contacts.last_name FROM employees INNER JOIN contacts ON employees.employee_id = contacts.contact_id WHERE employees.first_name = 'Sarah';
This SQL Server AND condition example would return all rows where the first_name in the employees table is 'Sarah'. And the employees and contacts tables are joined on the employee_id from the employees table and the contact_id from the contacts table. You will notice that all of the fields are prefixed with the table names (ie: contacts.last_name). This is required to eliminate any ambiguity as to which field is being referenced; as the same field name can exist in both the employees and the contacts tables.
In this case, the result set would only display the employee_id and last_name fields (as listed in the first part of the SELECT statement.).
DO:
This SQL Server AND condition example would return all rows where the first_name in the employees table is 'Sarah'. And the employees and contacts tables are joined on the employee_id from the employees table and the contact_id from the contacts table. You will notice that all of the fields are prefixed with the table names (ie: contacts.last_name). This is required to eliminate any ambiguity as to which field is being referenced; as the same field name can exist in both the employees and the contacts tables.
In this case, the result set would only display the employee_id and last_name fields (as listed in the first part of the SELECT statement.).
DO:
This SQL Server AND condition example would return all rows where the first_name in the employees table is 'Sarah'. And the employees and contacts tables are joined on the employee_id from the employees table and the contact_id from the contacts table. You will notice that all of the fields are prefixed with the table names (ie: contacts.last_name). This is required to eliminate any ambiguity as to which field is being referenced; as the same field name can exist in both the employees and the contacts tables.
In this case, the result set would only display the employee_id and last_name fields (as listed in the first part of the SELECT statement.).
SELECT employees.employee_id, contacts.last_name FROM employees INNER JOIN contacts ON employees.employee_id = contacts.contact_id WHERE employees.first_name = 'Sarah';
This SQL Server AND condition example would return all rows where the first_name in the employees table is 'Sarah'. And the employees and contacts tables are joined on the employee_id from the employees table and the contact_id from the contacts table. You will notice that all of the fields are prefixed with the table names (ie: contacts.last_name). This is required to eliminate any ambiguity as to which field is being referenced; as the same field name can exist in both the employees and the contacts tables.
In this case, the result set would only display the employee_id and last_name fields (as listed in the first part of the SELECT statement.).
status | not learned | measured difficulty | 37% [default] | last interval [days] | |||
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repetition number in this series | 0 | memorised on | scheduled repetition | ||||
scheduled repetition interval | last repetition or drill |