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Re: FrontBase SQL: date formatting, „local variable“?
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Re: FrontBase SQL: date formatting, „local variable“?


  • Subject: Re: FrontBase SQL: date formatting, „local variable“?
  • From: Samuel Pelletier <email@hidden>
  • Date: Fri, 11 Mar 2016 19:11:56 -0500

Hi OC,

The easiest way to get a date a YYYYMMDD is this:

CAST(EXTRACT(year FROM "dateColumn") * 10000 + EXTRACT(month FROM "dateColumn") * 100 + EXTRACT(day FROM "dateColumn") as CHAR(8))


A more flexible way is to create a function (you can adjust the format):

create function formatDateOC(IN :"date" Timestamp) returns VARCHAR(20)
begin
declare "month" VARCHAR(20);
declare "day" VARCHAR(20);

set :"month" = CAST(EXTRACT(month FROM :"date") as VARCHAR(20));
set :"day" = CAST(EXTRACT(day FROM :"date") as VARCHAR(20));

if (char_length(:"month") = 1) then set :"month" = '0' || :"month"; END IF;
if (char_length(:"day") = 1) then set :"day" = '0' || :"month"; END IF;

return CAST(EXTRACT(year FROM :"date") as VARCHAR(4)) || :"month" || :"day";
end

To test it:  values formatDateOC(cast(current_timestamp as timestamp))

Replace the argument by any timestamp value or column name that contains a timestamp.

Samuel


> Le 11 mars 2016 à 17:57, OC <email@hidden> a écrit :
>
> Well...
>
> On 11. 3. 2016, at 22:06, OC <email@hidden> wrote:
>
>> Still, it can be solvable (perhaps even easily)
>>
>> (a) in standard SQL92 which I don't know well enough
>> (b) in some FrontBase-specific extension
>>
>> which is why I am asking.
>
> ... without better knowledge the SQL used to derive the attribute looks like this. Yes, it is _terribly_ ugly, but I can't see how to simplify it whilst keeping the functionality. I would appreaciate if anybody sees and advices how to simplify this brute, especially if there's a way to get rid of the repeated nested SELECTs:
>
> ===
> CASE
>  WHEN ( SELECT C_SHORTCUT FROM T_MARKET WHERE T_MARKET.C_UID = C_MARKET_ID ) IS NULL
>  THEN
>    'Market(' ||
>    CAST(C_MARKET_ID as VARCHAR(18)) ||
>    ')'
>  ELSE ( SELECT C_SHORTCUT FROM T_MARKET WHERE T_MARKET.C_UID = C_MARKET_ID )
> END ||
> '-' ||
> CASE
>  WHEN ( SELECT C_START_DATE FROM T_TIME_CHUNK WHERE T_TIME_CHUNK.C_UID = C_TIME_CHUNK_UID ) IS NULL THEN '0'
>  ELSE
>    CAST(EXTRACT(year FROM ( SELECT C_START_DATE FROM T_TIME_CHUNK WHERE T_TIME_CHUNK.C_UID = C_TIME_CHUNK_UID )) AS VARCHAR(4)) ||
>    CASE
>      WHEN EXTRACT(month FROM ( SELECT C_START_DATE FROM T_TIME_CHUNK WHERE T_TIME_CHUNK.C_UID = C_TIME_CHUNK_UID ))<10 THEN '0'
>      ELSE ''
>    END ||
>    CAST(EXTRACT(month FROM ( SELECT C_START_DATE FROM T_TIME_CHUNK WHERE T_TIME_CHUNK.C_UID = C_TIME_CHUNK_UID )) AS VARCHAR(2)) ||
>    CASE
>      WHEN EXTRACT(day FROM ( SELECT C_START_DATE FROM T_TIME_CHUNK WHERE T_TIME_CHUNK.C_UID = C_TIME_CHUNK_UID ))<10 THEN '0'
>      ELSE ''
>    END ||
>    CAST(EXTRACT(day FROM ( SELECT C_START_DATE FROM T_TIME_CHUNK WHERE T_TIME_CHUNK.C_UID = C_TIME_CHUNK_UID )) AS VARCHAR(2))
> END ||
> '-' ||
> CAST(C_AUCTION_SEQ as VARCHAR(18))
> ===
>
> Thanks and all the best,
> OC
>
>
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References: 
 >FrontBase SQL: date formatting, „local variable“? (From: OC <email@hidden>)
 > Re: FrontBase SQL: date formatting, „local variable“? (From: Chuck Hill <email@hidden>)
 >Re: FrontBase SQL: date formatting, „local variable“? (From: OC <email@hidden>)
 >Re: FrontBase SQL: date formatting, „local variable“? (From: OC <email@hidden>)

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