One Update Statment

Question

Hi ,
I wana use two column conditionally in an update statement rather then writing two statement for each conditions.
  update war_room_report_aged
     set case when p_business_days_old=15 then nrpc_15_days
              when p_business_days_old=25 then nrpc_25_days
              when p_business_days_old=10 then nrpc_10_days end  = exceeds_sr.c_date_recd
   where bus_unit_abbrev = exceeds_sr.abr_bus_unit||'_'||exceeds_sr.abr_sub
     and todays_date     = p_end_date
     and tio_priority    = p_level;I can do it with two statement seperatly ,but i got in a situation where there would be more than 5 columns need to be updated according to parameter's value.
if p_business_days_old=15 then
update war_room_report_aged
     set  nrpc_15_days=exceeds_sr.c_date_recd
   where bus_unit_abbrev = exceeds_sr.abr_bus_unit||'_'||exceeds_sr.abr_sub
     and todays_date     = p_end_date
     and tio_priority    = p_level;
elsif p_business_days_old=25 then
update war_room_report_aged
     set  nrpc_25_days=exceeds_sr.c_date_recd
   where bus_unit_abbrev = exceeds_sr.abr_bus_unit||'_'||exceeds_sr.abr_sub
     and todays_date     = p_end_date
     and tio_priority    = p_level;
elsif .. then
end if;Can i made the same above in one statment?I am so devastated as there gonna be more than 10 conditions for 10 parameter and for each parameter's value relate to seperate 10 cloumns.

Answer 1

You can do it this way:
create table test_table
pk_col     number,
cond_1     number,
col_1      varchar2(5),
cond_2     number,
col_2      varchar2(5),
cond_3     number,
col_3      varchar2(5)
insert into test_Table values (1, 10, 'AAA', 20, 'BBB', 30, 'CCC');
update test_table
   set col_1 = decode(&input, 10, col_1 || '1', col_1),
       col_2 = decode(&input, 20, col_2 || '1', col_2),
       col_3 = decode(&input, 30, col_3 || '1', col_3)
where pk_col = 1;
select *
  from test_table;
PK_COL                 COND_1                 COL_1 COND_2                 COL_2 COND_3                 COL_3
1                      10                     AAA1  20                     BBB   30                     CCCLogic is to check if the variable matches a certain Input condition, then update the column with new value, else just update it with Itself. This way, you achieve it in a single SQL and still do not risk losing column information.