插入选择不存在的位置

Question

Hello I'm still struggling with the following code

INSERT INTO m4zbv_mt_cfvalues (cf_id, link_id,value) 
    SELECT 87,link_id,1
    FROM m4zbv_mt_links WHERE Upper(`link_name`) like'%#VMWARE APPLIANCE DEFAULT PASSWORDS%'
    WHERE NOT EXISTS(select cf_id, link_id from m4zbv_mt_cfvalues where cf_id=87 and link_id=m4zbv_mt_links.link_id)

This section works fine:

INSERT INTO m4zbv_mt_cfvalues (cf_id, link_id,value) 
    SELECT 87,link_id,1
    FROM m4zbv_mt_links WHERE Upper(`link_name`) like'%#VMWARE APPLIANCE DEFAULT PASSWORDS%'

I'm unsure how I can pass the values for m4zbv_mt_links.link_id from the first select and how to integrate the WHERE NOT EXISTS

Thanks for any help

Answer 1

It should be and instead of where :

INSERT INTO m4zbv_mt_cfvalues (cf_id, link_id,value) 
SELECT 87,link_id,1
FROM m4zbv_mt_links WHERE Upper(`link_name`) like'%#VMWARE APPLIANCE DEFAULT PASSWORDS%'
and NOT EXISTS
               (select cf_id, link_id 
                from m4zbv_mt_cfvalues 
                where cf_id=87 and link_id=m4zbv_mt_links.link_id)

Answer 2

如果您只是想避免重复，则只需INSERT IGNORE（并删除WHERE NOT EXISTS子句）