sql

random record from a aggregation

MAX(scn.guid) KEEP (DENSE_RANK FIRST ORDER BY DBMS_RANDOM.VALUE) AS random_sample

insert

insert into TABEL (a_id,t_id,dtm) values(123,456, systimestamp);

date

where dt>to_date('01-07-2023','DD-MM-YYYY')

record met wijzigingsdatum vandaag

where u.dt>=trunc(sysdate)

case / if

CASE WHEN a IS NOT NULL THEN 'ja' ELSE 'nee' END AS "gescand"

nodig als je meerdere langere teksten aan elkaar wilt plakken met group_concat. staat standaard op 1024

$db->prepare("SET GLOBAL group_concat_max_len=100000;")->execute();

create slug from title

CONCAT('story/',LOWER(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(tv.field_cast_video_title, ' ', '-'), ',', ''), '.', ''), ':', ''), '/', '-'),'''',''),'---','-'),'--','-')))) "url_alias",

via 'CONNECT BY PRIOR' alle 'dieper liggende record' vinden op basis van de ID van een bovenliggend record

SELECT * FROM appels
START WITH ID = 1305602
CONNECT BY PRIOR ID = ParentID;

order by in a group_concat (mysql)

select 
  node.nid "ID", 
  #...
  group_concat(rel.field_location_target_id order by rel.delta) "locaties"
from node 
  #...
left join field_revision_field_location rel on rel.entity_id = node.nid
where node.type='series'
group by 
  node.nid,
  #.....
;

recursive title lookup for titles (TRAVERSING!)

SELECT LISTAGG(a.id, '...')
FROM apples a
CONNECT BY PRIOR parent_id = id
START WITH id=123123
ORDER BY level DESC

or with a subselect to get apple titles from another table:

SELECT LISTAGG((SELECT title FROM apple_descriptions b WHERE b.id=a.id),' ... ')
FROM apples a
CONNECT BY PRIOR parent_id = id
START WITH id=123123
ORDER BY level DESC

or with a join to retrieve titles from the titles table:

select listagg(t.title, '...')
from apples a
join apple_titles t on t.id=a.id
connect by prior a.parent_id = a.id
start with a.id=724423
order by level desc

order by (within group)

SELECT LISTAGG(b.title, ' ... ') WITHIN GROUP (ORDER BY level DESC)  "context"
FROM apples a
JOIN apple_titles b ON b.id=a.id
CONNECT BY PRIOR a.parent_id = a.id
START WITH a.id=724423

oracle version

select * from v$version;

changes on a certain day

where aew.dt >= DATE '2023-01-05' and  aew.dt < DATE '2023-01-06'

ignore &'s in sql values

set define off

date field condition

select * from TABLE where dt >= DATE '2022-12-22'

rownum (oracle)

where ROWNUM<5000

select case select

case when MY_FUNC(persoon.id, 'ROL')='Bruid' 
     then concat('  ',persoon.beschrijving)
     else persoon.beschrijving end "Persoon"

for every record replace part of the value

UPDATE adressen
SET straat = REPLACE(straat, 'https://data.kkg.kadaster.nl/id/openbareRuimte/', '')

regexp_like

regexp_like(beschrijving, '^1221-1|^1221-2|^1221-3|^1221|^1232|^1394|^1395|^1396|^1397|^463|^481')

regex_substr

REGEXP_SUBSTR(besch.beschrijving, '(\()(\d*)\)')

regexp_replace

regexp_replace(besch.beschrijving, 'xxx', '')

regexp_replace with substr / groups

regexp_replace(REGEXP_SUBSTR(besch.beschrijving, '(\()(\d*)\)'), '\(|\)','') "AantalFotos"