I have a tricky update to make. Any help is highly appreciated. Thanks in advance for your help.
Here is the scenario as shown on the image attached. I have to update P_main.ver_key from Versions.verkey where P_main.ver_key is null. The logic is to get the ver_key for that pid where Versions.pcmm<=max(P_main.vdmm). The values that should be populated in the null spots are shown in the 'after update' column on the image.
example:
P_main table:
pid = 50000178
vcmm= 2014027001
Versions table:
pid = 50000178
max pdmm <=2014027001 is 2014032000
therefore update ver_key = 154