Before update - the screenshot below shows that the Unit Price for the two products are and (for Category ID 2 only - Condiments). Now the Unit Price for the two products are increased by 10% to and .2 Practice #2: Update Unit Price for the top 5 most expensive products.
The following update query reduces the Unit Price by 10% for the top 5 most expensive products.
All the steps listed below is suitable for updating multiple rows.
But, step 2, 3 is not required for deleting multiple rows.
First, let us start coding for updating multiple rows.
Subclasses should override the default behavior, which is a straight identity comparison.
**kw are arguments consumed by subclass compare() methods and may be used to modify the criteria for comparison. Common table expressions are a SQL standard whereby SELECT statements can draw upon secondary statements specified along with the primary statement, using a clause called “WITH”.To instruct My SQL how to pick the products for update, we use ORDER BY clause. In this query, the data is sorted by Product ID in ascending order and the first 2 products are chosen by the LIMIT 2 clause.Copy and paste the following SQL to your SQLyog free Community Edition query window.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.This article deals with selecting multiple rows for applying update/delete operations.