Mysql updating multiple rows consolidating and accelerating exports in bangladesh
We have used a table called 'item' to apply the query: Table Name : item Structure : item_code varchar(20), value int(11), quantity int(11) where item_code is the primary key.
In the following rows of item table, 'value' column which is marked with red rectangle will be updated.
The field_name field is updated to the corresponding value: value_1, value_2, or value_3 if the id equals to 1, 2, or 3: Yet another way ============================================= There’s also another way of doing this: INSERT …
ON DUPLICATE KEY UPDATE Sorry I’m a bit lost here – is your update method using CASE part of the original method (eg: creating a temporary table, inserting first) or is that a way to avoid a temporary table all together?
(pk_vals, update_vals) ON DUPLICATE KEY UPDATE update_col=VALUES(update_col), …
update_col=VALUES(update_col); OPTIMIZE TABLE tbl_name; Example as per article: INSERT INTO categories (id, display_order, title) VALUES (1, 3, ‘New Title 1’), (2, 4, ‘New Title 2’), (3, 5, ‘New Title 3’) ON DUPLICATE KEY UPDATE display_order=VALUES(display_order), title=VALUES(title); OPTIMIZE TABLE tbl_name; The advantage of this solution is that it’s driven by the indexing of the primary keys, on which a CASE cannot rely.
Updating My SQL Table using PHP Script You can update My SQL table data (using UPDATE command) through a PHP script.
My SQL UPDATE with WHERE My SQL UPDATE command can be used with WHERE clause to filter (against certain conditions) which rows will be updated.A requirement arises in many systems to update multiple SQL database rows.For small numbers of rows requiring updates, it can be adequate to use an UPDATE statement for each row that requires an update.The following My SQL statement will update purch_price with purch_price multiplied by 5 if it satisfies the condition defined in the subquery started with SELECT wrapped within a pair of parenthesis.The subquery retrieves only those cate_ids from purchase table if their corresponding receive_qty is more than 10.My SQL UPDATE multiple columns My SQL UPDATE command can be used to update multiple columns by specifying a comma separated list of column_name = new_value.Where column_name is the name of the column to be updated and new_value is the new value with which the column will be updated.The following My SQL statement will update the 'receive_qty' column of newpurchase table with a new value 25 if the value of purch_price is more than 50.My SQL UPDATE using NULL My SQL UPDATE command can be used to update a column value to NULL by setting column_name = NULL, where column_name is the name of the column to be updated.Could you please provide the structure of the options table? Have you benchmarked the CASE statement to see if it is actually better than the temporary table solution?I’d also be interested in how both solutions compare to just doing an INSERT ON DUPLICATE KEY UPDATE.