[英]Using LISTAGG/XMLAGG not working as expected
LISTAGG
正在使用< 4000
但不是> 4000
。 当我尝试给XMLAGG
而不是LISTAGG
时,它不起作用。
SELECT LISTAGG(
CONCAT(
CONCAT(
(
SELECT CONCAT( USER_FIRST_NM, CONCAT(',', USER_LAST_NM) )
FROM USER_TABLE
WHERE USER_LOGONID = USER_ID
),
CONCAT( ' - ', TO_CHAR(CREATED_DATE, 'DD-MON-YY HH:MI AM'))
),
CONCAT(chr(10), NOTES)
),
chr(10)
) WITHIN GROUP (
ORDER BY
MOBILES,
created_date ASC
) NOTES
FROM MOBILES_notes
WHERE MOBILES_ELEMENT = :p1
ORDER BY CREATED_DATE
XMLAGG()
和XMLELEMENT()
function 可能用于大数据,例如
SELECT RTRIM(DBMS_XMLGEN.CONVERT(
XMLAGG(
XMLELEMENT(e,
CONCAT(CONCAT((SELECT CONCAT(user_first_nm,
CONCAT(',', user_last_nm))
FROM USER_TABLE
WHERE user_logonid = user_id),
CONCAT(' - ',
TO_CHAR(created_date,
'DD-MON-YY HH:MI AM'))),
CONCAT(CHR(10), NOTES))||CHR(10)
) ORDER BY mobiles, created_date
).EXTRACT('//text()').GETCLOBVAL() ,1),',') AS notes
FROM mobiles_notes
WHERE mobiles_element = :p1
ORDER BY created_date
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