Oracle SQL: Conditionally update a table based on comparison with a SQL statement -


i have table (table1) has 4 columns:

uid | pid | value1 | value2

i have sql statement (stmt) returns 3 columns other tables:

uid | pid | value1

now here condition of how want update table1:

first, compare uid , pid pair stmt in table1,

  1. for new uid , pid pair not in table1, insert new row stmt table1, set table1.value2 = 0 (i've done one)

  2. for existing uid , pid pair in both stmt , table1, do:

    a. if table1.value2 > 0, update table1.value1 = stmt.value1

    b. if table1.value2 = 0 , if table1.value1 != stmt.value1, update table1.value1 = stmt.value1, otherwise nothing.

i'm having trouble coming solution condition 2. appreciated!

update (     select table1.uid            ,table1.pid            ,table1.value1 table1_value1            ,table1.value2 table1_value2            ,stmt.value1 stmt_value1     table1     inner join (select ? uid                        ,? pid                        ,? value1                 whatever) stmt         on stmt.uid = table1.uid         , stmt.pid = table1.pid ) x set x.table1_value1 = case when (x.table1_value2 > 0) or                               (x.table1_value2 = 0 , x.table1_value1 <> x.stmt_value1)                               x.stmt_value1                          else x.table1_value1                      end

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