Updating multiple rows in mysql


12-Aug-2019 03:16

updating multiple rows in mysql-47

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While implementing multiple rows update or delete, we need to follow some steps.

All the steps listed below are suitable for updating multiple rows.

Yet, we have seen about how to update and delete table rows one at a time.

This article deals with selecting multiple rows for applying update/delete operations.

the following statement sets col2 to the current (updated) col1 value, not the original col1 value.

The result is that col1 and col2 have the same value. UPDATE t1 SET col1 = col1 1, col2 = col1; select now(); select now(), sleep(10), now(); select now(); --------------------- | now() | --------------------- | 2018-11-05 | --------------------- 1 row in set (0.00 sec) --------------------- ----------- --------------------- | now() | sleep(10) | now() | --------------------- ----------- --------------------- | 2018-11-05 | 0 | 2018-11-05 | --------------------- ----------- --------------------- 1 row in set (10.00 sec) --------------------- | now() | --------------------- | 2018-11-05 | --------------------- 1 row in set (0.00 sec) This way you can use the variables as many times as you can, not only in mysql statements but also in the server-side scripting-language(like PHP) you are using in your project.

updating multiple rows in mysql-35

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So, while printing user table entries dynamically to the list view, the loop should contain the following items.

So, is there any other way around with just a few My SQL queries that equals to millions of single row update queries? This table should have 2 columns: 1) an ID column that references the original record’s primary key in the original table, 2) the column containing the new value to be updated with.



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