This shows rows in sku where there is no corresponding row in sku_classification_sku. I run this query and then put the results grid into update mode on table sku_classification_sku and then type entries in for table sku_classification_sku. SQLyog generates and executes UPDATE statements, but should be generating INSERT statements. (skuclassificationskuid is the PK for table sku_classification_sku.)
UPDATE `gf`.`sku_classification_sku` SET `skuid` = ‘2878’ , `classificationid` = ’13’ WHERE `skuclassificationskuid` IS NULL;
should be something like
INSERT INTO `gf`.`sku_classification_sku` SET `skuid` = ‘2878’ , `classificationid` = ’13’;
I think SQLyog should be smart enough to understand that skuclassificationskuid is the primary key of the sku_classification_sku table, so an update with a null PK doesn’t make sense, so an insert is needed instead.