> -----Original Message-----
> From: Jirí Cincura [mailto:j...@cincura.net]
> Sent: Viernes, 11 de Septiembre de 2015 6:10
>
> Hi,
>
> can somebody explain this behavior? Tested on FB 2.5.4 and
> 2.5.3 x64 SC.
>
> CREATE TABLE T_TRANSLATION_META (
> F_TRM_ID BIGINT NOT NULL,
> F_TRM_CODE VARCHAR(512) CHARACTER SET UTF8 NOT
> NULL COLLATE
> UNICODE_CI
> );
The collation is stored in rdb$relation_fields not in rdb$fields.
SQL> select rdb$collation_id from rdb$relation_fields
where rdb$relation_name = 'T_TRANSLATION_META';
RDB$COLLATION_ID
================
<null>
3 <----
> CREATE TABLE T_COUNTRY (
> F_CNR_ID BIGINT NOT NULL,
> F_TRM_NAME_ID BIGINT DEFAULT -1 NOT NULL,
> CF_CNR_NAME COMPUTED BY (((select
> F_TRM_CODE
> from T_TRANSLATION_META
> where F_TRM_ID = F_TRM_NAME_ID)))
> );
>
> Now this returns `null` (RDB$5 is CF_CNR_NAME).
> select rdb$collation_id from rdb$fields where rdb$field_name = 'RDB$5'
SQL> set list;
SQL> select rdb$field_name, rdb$collation_id
from rdb$relation_fields
where rdb$relation_name = 'T_COUNTRY';
....
RDB$FIELD_NAME CF_CNR_NAME
RDB$COLLATION_ID 3 <------
Again, it's in rdb$relation_fields not in rdb$fields.
> Now I later the above mentioned field to the same expression.
> ALTER TABLE T_COUNTRY ALTER CF_CNR_NAME COMPUTED BY (((select
> F_TRM_CODE
> from T_TRANSLATION_META
> where F_TRM_ID = F_TRM_NAME_ID)));
>
> But now the query for rdb$collation_id returns 3. What the hell?
Probably Mark would say your way of formulating the question is not very
polite.
;-)
I sent an email to the master of hell and he answered it's the result of the
complex logic to alter tables and fields.
SQL> select rdb$field_name, rdb$collation_id
from rdb$relation_fields
where rdb$relation_name = 'T_COUNTRY'
and rdb$collation_id is not null
union all
select rdb$field_name, rdb$collation_id
from rdb$fields where rdb$field_name = 'RDB$5';
RDB$FIELD_NAME CF_CNR_NAME
RDB$COLLATION_ID 3
RDB$FIELD_NAME RDB$5
RDB$COLLATION_ID 3
Now it's in both sys tables.
C.
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