EDIT: Ajout de meilleurs noms d'alias et explicites CROSS JOIN
. Ajouté la version XMLAGG
.
NB:LISTAGG
existe depuis la version Oracle 11.2 et les années suivantes et retourne VARCHAR2
. Si la chaîne de sortie est supérieure à 4000 Ko ou si vous utilisez une version antérieure, vous pouvez utiliser XMLAGG
, ce qui est un peu plus compliqué à utiliser (eg. http://psoug.org/definition/xmlagg.htm).
Avec LISTAGG
(retour VARCHAR2
):
SELECT LISTAGG (line,
CHR (13) || CHR (10) || 'union all' || CHR (13) || CHR (10))
WITHIN GROUP (ORDER BY sortorder)
script
FROM (SELECT line, ROWNUM sortorder
FROM ( SELECT 'select '
|| LISTAGG (
CASE
WHEN tc.column_name IS NULL
THEN
'''NULL'' as '
END
|| col_join.column_name,
', ')
WITHIN GROUP (ORDER BY col_join.column_name)
|| ' from '
|| col_join.owner
|| '.'
|| col_join.table_name
line
FROM dba_tab_columns tc
RIGHT OUTER JOIN
(SELECT DISTINCT
owner, table_name, col_list.column_name
FROM dba_tab_columns
CROSS JOIN
(SELECT DISTINCT column_name
FROM dba_tab_columns
WHERE owner LIKE 'SMHIST%') col_list
WHERE owner LIKE 'SMHIST%') col_join
ON tc.owner = col_join.owner
AND tc.table_name = col_join.table_name
AND tc.column_name = col_join.column_name
GROUP BY col_join.owner, col_join.table_name
ORDER BY col_join.owner, col_join.table_name))
Avec XMLAGG
(retour CLOB
en ajoutant .getclobval()
, note: RTRIM
travaille ici parce que les noms de table ne peut pas inclure ','
et ' '
(espace)):
SELECT REPLACE (SUBSTR (script, 1, LENGTH (script) - 12),
'&' || 'apos;',
'''')
FROM (SELECT XMLAGG (
XMLELEMENT (
e,
line,
CHR (13)
|| CHR (10)
|| 'union all'
|| CHR (13)
|| CHR (10))).EXTRACT ('//text()').getclobval()
script
FROM (SELECT line, ROWNUM sortorder
FROM ( SELECT 'select '
|| RTRIM (
REPLACE (
XMLAGG (XMLELEMENT (
e,
CASE
WHEN tc.column_name
IS NULL
THEN
'''NULL'' as '
END
|| col_join.column_name,
', ') ORDER BY
col_join.column_name).EXTRACT (
'//text()').getclobval(),
'&' || 'apos;',
''''),
', ')
|| ' from '
|| col_join.owner
|| '.'
|| col_join.table_name
line
FROM dba_tab_columns tc
RIGHT OUTER JOIN
(SELECT DISTINCT
owner,
table_name,
col_list.column_name
FROM dba_tab_columns
CROSS JOIN
(SELECT DISTINCT column_name
FROM dba_tab_columns
WHERE owner LIKE 'SMHIST%') col_list
WHERE owner LIKE 'SMHIST%') col_join
ON tc.owner = col_join.owner
AND tc.table_name = col_join.table_name
AND tc.column_name = col_join.column_name
GROUP BY col_join.owner, col_join.table_name
ORDER BY col_join.owner, col_join.table_name)))