====== Ошибки при создании метаданных ======

При создании метаданных (таблицы, тригеры, домены и т.д.) мы можем получить ошибки которые будут не очень понятны начинающему пользователю

===== Создание индекса с существующим именем ==

<code sql>
CREATE INDEX COUNTRY_IDX1 ON COUNTRY (CURRENCY);
CREATE INDEX COUNTRY_IDX1 ON COUNTRY (CURRENCY);
</code>

This operation is not defined for system tables.\\
unsuccessful metadata update.\\
STORE RDB$INDICES failed.\\
attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_5".


===== Создание генератора с существующим именем ==

<code sql>create generator test;
create generator test;</code>

This operation is not defined for system tables.\\
unsuccessful metadata update.\\
DEFINE GENERATOR failed.\\
attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_11".


===== Создание таблицы с одноименными полями ==

<code sql>create table test(x int, x varchar(30));</code>

This operation is not defined for system tables.\\
unsuccessful metadata update.\\
STORE RDB$RELATION_FIELDS failed.\\
attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_15".


===== Создание процедуры с одноименными полями ==

<code sql>create procedure test (t int) returns (t varchar(30))
as 
begin
end;</code>

This operation is not defined for system tables.\\
unsuccessful metadata update.\\
STORE RDB$PROCEDURE_PARAMETERS failed.\\
attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_18".


===== Создание домена с существующим именем ==

<code sql>create domain test smallint;
create domain test smallint;
</code>

This operation is not defined for system tables.\\
unsuccessful metadata update.\\
STORE RDB$FIELDS failed.\\
attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_2".


===== Создание триггера с существующим именем ==
 
<code sql>CREATE trigger country_bi0 for country
active before insert position 0
AS
begin
  /* Trigger text */
end;
CREATE trigger country_bi0 for country
active before insert position 0
AS
begin
  /* Trigger text */
end;</code>

This operation is not defined for system tables.\\
unsuccessful metadata update.\\
DEFINE TRIGGER failed.\\
attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_8".



===== Создание UDF с существующим именем ==
 
<code sql>DECLARE EXTERNAL FUNCTION DIV
    INTEGER,
    INTEGER
RETURNS DOUBLE PRECISION BY VALUE
ENTRY_POINT 'IB_UDF_div' MODULE_NAME 'ib_udf';
DECLARE EXTERNAL FUNCTION DIV
    INTEGER,
    INTEGER
RETURNS DOUBLE PRECISION BY VALUE
ENTRY_POINT 'IB_UDF_div' MODULE_NAME 'ib_udf';</code>

This operation is not defined for system tables.\\
unsuccessful metadata update.\\
DEFINE FUNCTION failed.\\
attempt to store duplicate value (visible to active transactions) in unique index "RDB$INDEX_9".