query SQL fetch high two recordings for a given column

Hello world

I have to extract the first two records, I'm actually brings together a few tables and retrieve data

my query:

Select rst.tl_id tl, xwlst.well_id

R_tool pay RST,

extended x_class

r_class rsc,

x_tool xwlst

where rst.r_tool_id = xstc.r_tool_id

and rsc.r_class_id = xstc.r_class_id

and xwlst.r_tool_id = rst.r_tool_id

Rst.r_well_log_service_tool_id group, xwlst.well_log_id

max (rsc.precedence) desc order

the data are:

TL_IDWELL_ID
86405061127
48015061127
86365061127
25635061128
66125061128
25385061128
8435061128
137545061129
125375061129
26095061129
8575061129

I want two recordings of songs for a well_id based on the above data

TL_ID WELL_ID
86405061127
48015061127
25635061128
66125061128
137545061129
12537

5061129

Please advise on this.

Hanks,

Hello

Here's a way to do it:

WITH got_r_num AS

(

Select rst.tl_id - no need to give an identical alias column name

xwlst.well_id

Rank () OVER (PARTITION BY xwlst.well_id

ORDER OF MAX (rsc.precedence) / / DESC

) AS r_num

R_tool pay RST,

extended x_class

r_class rsc,

x_tool xwlst

where rst.r_tool_id = xstc.r_tool_id

and rsc.r_class_id = xstc.r_class_id

and xwlst.r_tool_id = rst.r_tool_id

Rst.r_well_log_service_tool_id group, xwlst.well_log_id

)

SELECT tl, well_id

OF got_r_num

WHERE r_num<=>

;

If you would care to post CREATE TABLE and INSERT statements for your sample data, and then I could test this.

What happens if there is a tie, and lines 3 (or more) have equal claims to be in the top 2?  You may need to add expressions of tiebreaker to the analytical ORDER BY clause or use ROW_NUMBER instead of RANK.  If it is possible in your application, then include an example when you post the CREATE TABLE and INSERT statements and publish the accurate results you want from these data.

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------------- -------- --------- -------------------- ------------ ------- -------- ---------------- -------- ---------- ------ ------- ----- -------------
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    select  owner,
        object_name,
        case
          when trunc(created) = trunc(sysdate - 1) then to_char(created,'MM-DD-YYYY HH24:MI:SS')
        end "Yesterday",
        case
          when trunc(created) = trunc(sysdate - 7) then to_char(created, 'MM-DD-YYYY HH24:MI:SS')
        end "Week Ago"
  from  dba_objects
  where object_type = 'TABLE'
    and (
            trunc(created) = trunc(sysdate - 1)
         or
            trunc(created) = trunc(sysdate - 7)
        )
/

    SY.

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