topic Re: Drop all Tables except in App Development

Drop all Tables except

chriys1337 — Thu, 15 Feb 2018 09:21:51 GMT

Hi,

I am looking for a way to drop all existing tables in my datamodel, except some Tables which can be stated in the script.

I have found in the Community two solutions, which I tried and it definitely does not work for me.

(

Drop All Tables Except)

Anybody has a workable solution for this case?

Thx a lot,

Chris

Re: Drop all Tables except

graziellas82 — Mon, 16 Apr 2018 13:21:38 GMT

I Christian,

What is your issue with drop table statement?

I had a problem wit it too, but I resolved. My problem was that at the end of the script not all table were dropped.

After tests and retest, I undertood that, during dropping, the 'TableNumber' of existing table change!! So, if for example the number of "TableX" at the beginning is 15, during dropping can change in 10, 5,0...and when the n of your FOR is 15, the function "tablename(15)" is null.

Then I revolved using a different approach...not a cycle, but a long string.

FOR i = 0 to NoOfTables()-1

TableList:

LOAD TableName($(i)) as Tablename AUTOGENERATE 1

WHERE not WildMatch(TableName($(i)), 'TableA','TableB','TableC');

NEXT i

TableList1:

load concat(Tablename, ',') as Tablename1

resident TableList;

let vdrop= peek('Tablename1');

DROP Tables TableList,TableList1;

DROP Tables $(vdrop);

I hope this can help you.

Re: Drop all Tables except

carahyba — Thu, 02 May 2019 17:46:44 GMT

Very nice and useful code, @graziellas82 !

I would like to suggest a little improvement:

Using '['&CONCAT(TABLENAME,'],[')&']' AS TABLENAME1 instead gives support for tables with space on it names.

Regards!