Access SQL UPDATE Guide

1 year ago
Isabella Edwards
1 minute

To update, query or replace data, you can use the UPDATE statement. Here are some examples:

  1. Update the value of a single field.
UPDATE 表名 SET 字段名 = 新值 WHERE 条件;

For example, update the salary of the employee named “John” in the table named “employees” to be 5000.

UPDATE employees SET salary = 5000 WHERE name = 'John';
  1. Update the values of multiple fields.
UPDATE 表名 SET 字段1 = 新值1, 字段2 = 新值2 WHERE 条件;

For example, update both the salary and position of the employee with the name “John” in the table named “employees”.

UPDATE employees SET salary = 5000, position = 'Manager' WHERE name = 'John';
  1. Update all the data in the table.
TRUNCATE TABLE 表名;

For example, to delete all data from the employee table named “employees”:

TRUNCATE TABLE employees;

Please be sure to back up your data before performing any updates or replacements to prevent any loss of important information.

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