sql - Update and insert TSQL -

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how can modify tsql update statement below insert partid of source table not in partid field of item id ='500224' in destination table. if doesn't exist need insert.

use [dbname]; go     update m     set [partid] = a.[partid]  select *     [sourcetable] m     inner join      [desttable]     on m.[bomitem] = a.[itemid]     , m.bomentry = a.bomentry ,  m.bomrev = a.rev      m.bomrev=a.rev , m.partid <> a.partid , m.linenbr = a.bomentry ;   go

in source table

enter image description here

in destination table

enter image description here

for example in pictures above partid 100280 doesn't exist in destination table want add , keep others same.

you can insert missing partid destination table, using left join null check.

insert [desttable] (bomitem, bomrev, bomenty, linenbr, dtype, partid, revid, qty) select st.itemid, st.rev, st.bomenty, st.linenbr, 0 dtype, st.partid, null revid, st.qty [sourcetable] st left join [desttable] dt on dt.bomitem = st.itemid , dt.partid = st.partid         , dt.bomrev = st.rev , dt.bomentry = st.bomentry -- remove these conditions if not need dt.partid null

since few of columns mismatching between 2 tables, have added proper column names in select


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