& ldquo; Show Create Table & rdquo; в Redshift [дубликат]

Для DDL:

• Сначала создайте вид администратора здесь: https://github.com/awslabs/amazon-redshift-utils/blob/master/src/AdminViews/ v_generate_tbl_ddl.sql
• Затем напишите запрос следующим образом:

  select ddl
  from admin.v_generate_tbl_ddl
  where schemaname = 'some_schema' and tablename='some_table'
  order by seq asc
  

Я не нашел ни одной функции в Redshift, которая предоставляет эту функцию. Вы можете получить полное определение представлений с помощью функции pg_get_viewdef:

SELECT 'create view '|| nc.nspname::information_schema.sql_identifier ||'.'|| c.relname::information_schema.sql_identifier ||' as '||
 pg_get_viewdef(c.oid)::information_schema.character_data AS view_definition
FROM pg_namespace nc, pg_class c, pg_user u
WHERE c.relnamespace = nc.oid AND u.usesysid = c.relowner AND c.relkind = 'v'::"char" 
AND nc.nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema');

Для определения таблиц я собрал запрос, но для выполнения некоторых деталей, как указано в прокомментированные строки:

select tm.schemaname||'.'||tm.tablename, 'create table '||tm.schemaname||'.'||tm.tablename
||' ('
||cp.coldef
-- primary key
-- diststyle
-- dist key
||d.distkey
--sort key 
|| (select 
' sortkey(' ||substr(array_to_string(
                 array( select ','||cast(column_name as varchar(100))  as str from
                       (select column_name from information_schema.columns col where  col.table_schema= tm.schemaname and col.table_name=tm.tablename) c2
                        join 
                        (-- gives sort cols
                          select attrelid as tableid, attname as colname, attsortkeyord as sort_col_order from pg_attribute pa where 
                          pa.attnum > 0  AND NOT pa.attisdropped AND pa.attsortkeyord > 0
                        ) st on tm.tableid=st.tableid and c2.column_name=st.colname   order by sort_col_order
                      )
                ,'')
              ,2,10000) || ')'
)
||';'
from 
-- t  master table list
(
SELECT substring(n.nspname,1,100) as schemaname, substring(c.relname,1,100) as tablename, c.oid as tableid 
FROM pg_namespace n, pg_class c
WHERE n.oid = c.relnamespace 
AND nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema')
AND c.relname <> 'temp_staging_tables_1'
-- and c.relname in ('f_recipient_registration','ht_base_document','ht_folder','ht_logical_file','ht_transaction_addresses','ht_ysi_batch','ht_ysi_batch_messages','ht_ysi_files') 
) tm 
-- cp  creates the col params for the create string
join
(select 
substr(str,(charindex('QQQ',str)+3),(charindex('ZZZ',str))-(charindex('QQQ',str)+3)) as tableid
,substr(replace(replace(str,'ZZZ',''),'QQQ'||substr(str,(charindex('QQQ',str)+3),(charindex('ZZZ',str))-(charindex('QQQ',str)+3)),''),2,10000) as coldef
from
( select array_to_string(array(
SELECT  'QQQ'||cast(t.tableid as varchar(10))||'ZZZ'|| ','||column_name||' '|| decode(udt_name,'bpchar','char',udt_name) || decode(character_maximum_length,null,'', '('||cast(character_maximum_length as varchar(9))||')'   )
-- default
|| decode(substr(column_default,2,8),'identity','',null,'',' default '||column_default||' ')
-- nullable
|| decode(is_nullable,'YES',' NULL ','NO',' NOT NULL ') 
-- identity 
|| decode(substr(column_default,2,8),'identity',' identity('||substr(column_default,(charindex('''',column_default)+1), (length(column_default)-charindex('''',reverse(column_default))-charindex('''',column_default)   ) )  ||') ', '') as str 
from  
-- ci  all the col info
(
select cast(t.tableid as int), cast(table_schema as varchar(100)), cast(table_name as varchar(100)), cast(column_name as varchar(100)), 
cast(ordinal_position as int), cast(column_default as varchar(100)), cast(is_nullable as varchar(20)) , cast(udt_name as varchar(50))  ,cast(character_maximum_length as int),
sort_col_order  , decode(d.colname,null,0,1) dist_key 
from (select * from information_schema.columns c where  c.table_schema= t.schemaname and c.table_name=t.tablename) c
left join 
(-- gives sort cols
select attrelid as tableid, attname as colname, attsortkeyord as sort_col_order from  pg_attribute a where 
 a.attnum > 0  AND NOT a.attisdropped AND a.attsortkeyord > 0
) s on t.tableid=s.tableid and c.column_name=s.colname
left join 
-- gives dist col
(select attrelid as tableid, attname as colname from pg_attribute a where
  a.attnum > 0 AND NOT a.attisdropped  AND a.attisdistkey = 't'
) d on t.tableid=d.tableid and c.column_name=d.colname
order by ordinal_position
) ci 
-- for the working array funct
), '') as str
from 
(-- need tableid
SELECT substring(n.nspname,1,100) as schemaname, substring(c.relname,1,100) as tablename, c.oid as tableid 
FROM pg_namespace n, pg_class c
WHERE n.oid = c.relnamespace 
AND nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema')
) t 
-- for the agg functions that dont exist
-- ) group by table_schema, table_name 
)) cp on tm.tableid=cp.tableid
-- add in primary key query here
-- dist key
left join
(  select 
-- close off the col defs after the primary key 
')' ||
' distkey('|| cast(column_name as varchar(100)) ||')'  as distkey, t.tableid
from information_schema.columns c
join 
(-- need tableid
  SELECT substring(n.nspname,1,100) as schemaname, substring(c.relname,1,100) as tablename, c.oid as tableid 
  FROM pg_namespace n, pg_class c
  WHERE n.oid = c.relnamespace 
  AND nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema')
) t on c.table_schema= t.schemaname and c.table_name=t.tablename
join 
-- gives dist col
(select attrelid as tableid, attname as colname from pg_attribute a where
  a.attnum > 0 AND NOT a.attisdropped  AND a.attisdistkey = 't'
  ) d on t.tableid=d.tableid and c.column_name=d.colname    
) d on tm.tableid=d.tableid