invalid sql statement in Toad - oracle db

问题

Below query gets me

invalid sql statement

in Toad

IF EXISTS (SELECT T_BASIS_ACCESS_ID FROM ECKERNEL_MCA.T_BASIS_ACCESS WHERE ROLE_ID LIKE 'MCA.GFS.LEAD') 
    BEGIN
       SELECT OBJECT_ID, NAME  FROM ECKERNEL_MCA.OV_AREA WHERE END_DATE IS NULL AND OBJECT_ID  IN
       (SELECT DISTINCT REPLACE(REPLACE(REPLACE(ATTRIBUTE_TEXT, '(', '' ),')',''), '''', '') 
       FROM ECKERNEL_MCA.T_BASIS_OBJECT_PARTITION WHERE T_BASIS_ACCESS_ID IN 
       (SELECT T_BASIS_ACCESS_ID FROM ECKERNEL_MCA.T_BASIS_ACCESS WHERE ROLE_ID LIKE 'MCA.GFS.LEAD') )
    END
ELSE
    BEGIN
       SELECT OBJECT_ID, NAME  FROM ECKERNEL_MCA.OV_AREA WHERE END_DATE IS NULL
    END

回答1:

This code really is invalid, as far as I can tell. The one that follows might compile. Note that:

I created local variables which will hold the result of SELECT statements. You need them in PL/SQL
I tried to show you that exceptions should be handled. There's no much use in "IF-THEN-ELSE" because - if the first SELECT (I named it "A") fails, it won't return NULL but raise NO_DATA_FOUND exception. I don't know your tables nor data you store in there, so - maybe this code is exception-free, I can't tell.
I couldn't test it as I don't have your tables, and didn't feel like creating them myself.

declare
  l_t_basis_access_id   eckernel_mca.t_basis_access.t_basis_access_id%type;
  l_object_id           eckernel_mca.ov_area.object_id%type;
  l_name                eckernel_mca.ov_area.name%type;
begin
  -- SELECT "A"
  select t_basis_access_id 
    into l_t_basis_access_id
    from eckernel_mca.t_basis_access
    where role_id like 'MCA.GFS.LEAD';

  -- SELECT "A" returned a single value - proceed with the next SELECT "B"

  -- SELECT "B"
  select object_id, name 
  into l_object_id,l_name
  from eckernel_mca.ov_area
  where end_date is null
    and object_id in (select distinct replace(replace(replace(attribute_text,'(',''),')',''),'''','')
                      from eckernel_mca.t_basis_object_partition
                      where t_basis_access_id in (select t_basis_access_id
                                                  from eckernel_mca.t_basis_access
                                                  where role_id like 'MCA.GFS.LEAD'
                                                 )
                     );
exception
  when no_data_found then
    -- SELECT "A" didn't return anything and raised no_data_found; but, SELECT "B" might 
    -- raise it as well
    select object_id, name 
    into l_object_id,l_name
    from eckernel_mca.ov_area
    where end_date is null;

  when too_many_rows then
    -- Any SELECT involved in this code could return it, so - handle it, if necessary
end;

来源：https://stackoverflow.com/questions/50179087/invalid-sql-statement-in-toad-oracle-db

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