mysql copy table fields to fields in another table

Sometimes, we need to copy an entire column of data in a certain field to another new field. This is very simple. SQL can be written like this:

UPDATE tb_1 SET content_target = content_source;

It is roughly written as follows:

Update {your_table} set {source_field} = {object_field} WHERE cause

It is better to have tools such as Navicat, you can directly Select a column of data, copy and paste it into the column you need. If it is the same table, there is no problem. If it is a new table, please keep their number of rows consistent. If the number of rows is inconsistent, you can create a new table and copy the columns into it, so that the number of IDs will remain consistent.

Sometimes these MySQL interface tools will report errors. In this case, it is better to use the command line. For example, to copy the data of a table field to the field of another table, you can write:

UPDATE tb_1 INNER JOIN tb_2 ON tb_1.tid = tb_2.tid
SET tb_1.tcontent = tb_2.tcontent

The following is a practical example. Write the link of the static page generated by PHPCMS into the url field in the phpcms_content table:

First piece it together like this Required url field column.

SELECT CONCAT(FROM_UNIXTIME(inputtime,'%Y/%m%d'), '/', contentid, '.html') AS dt FROM phpcms_content ORDER BY contentid DESC

Then in the query editor (navicat), copy the entire paragraph to the url column in the phpcms_content table.