How to copy MySQL table fields to another table field

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 can be 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 and 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 one table field data to another table field, 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, writing the link of the static page generated by PHPCMS into the url field in the phpcms_content table:

First piece together the required url field columns like this.

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.

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