Difference between revisions of "Update Queries"
| Line 1: | Line 1: | ||
| − | For updating values already entered into a database. Can edit multiple rows at once. Not using the WHERE clause will cause every entry to be edited. | + | ==== For updating values already entered into a database. Can edit multiple rows at once. Not using the WHERE clause will cause every entry to be edited. |
Editing 'table': | Editing 'table': | ||
:"UPDATE table SET column1=value1 WHERE column2=value2;" - Changes values in column1 to value1, where column2 equals value2. | :"UPDATE table SET column1=value1 WHERE column2=value2;" - Changes values in column1 to value1, where column2 equals value2. | ||
| − | :"UPDATE table SET column1=value1;" - Sets all values in the table, in column1, to value1 (regardless of their current value). | + | :"UPDATE table SET column1=value1;" - Sets all values in the table, in column1, to value1 (regardless of their current value). |
| − | :"UPDATE table SET column1=value1, column2=value2;" - Changes column1 to value1 and column2 to value2. | + | :"UPDATE table SET column1=value1, column2=value2;" - Changes column1 to value1 and column2 to value2. |
Revision as of 14:45, 21 December 2016
==== For updating values already entered into a database. Can edit multiple rows at once. Not using the WHERE clause will cause every entry to be edited.
Editing 'table':
- "UPDATE table SET column1=value1 WHERE column2=value2;" - Changes values in column1 to value1, where column2 equals value2.
- "UPDATE table SET column1=value1;" - Sets all values in the table, in column1, to value1 (regardless of their current value).
- "UPDATE table SET column1=value1, column2=value2;" - Changes column1 to value1 and column2 to value2.
