Oracle SQL Update Statement Query Syntax

Hello Experts,

I've created the following two temporary tables:

TABLE JS_ARRESTS (with the following fields)

CASE_ID
FILING_DATE
CASE_NUMBER
OFFENSE_DATE
ARREST_DATE
CHRG_NBR
DGOF_CD
CHARGE
CHRG_DESC
DFNDT_LAST_NAME
DFNDT_FIRST_NAME
DFNDT_MIDDLE_NAME
DFNDT_DOB
DFNDT_SSN
ARRAIGNMENT_DATE

TABLE JS_ARRAIGNMENT_EVENTS (with the following fields)

CASE_ID
CASE_NUMBER
COURT_DATE
EVENT_ID
COURTROOM
EVENT_CODE
EVENT_DESC
RESULT_DATE
RESULT_CODE
RESULT_DESC

I want to update the ARRAIGNMENT_DATE field in the JS_ARRESTS table
with the COURT_DATE values in the JS_ARRAIGNMENT_EVENTS table
whenever the JS_ARRESTS.CASE_ID = JS_ARRAIGNMENT_EVENTS.CASE_ID
and the JS_ARRAIGNMENT_EVENTS.COURT_DATE > JS_ARRESTS.ARREST_DATE.

I found the following update statement online, but when I use it in SQL Developer, I get the error message below.

update js_arrests
set arraignment_date = (select court_date
from js_arraignment_events
where js_arrests.case_id = js_arraignment_events.case_id
and js_arraignment_events.court_date > js_arrests.arrest_date)
where exists (select court_date
from js_arraignment_events
where js_arrests.case_id = js_arraignment_events.case_id
and js_arraignment_events.court_date > js_arrests.arrest_date);

Error report:
SQL Error: ORA-01427: single-row subquery returns more than one row
01427. 00000 -  "single-row subquery returns more than one row"
*Cause:    
*Action:
Janice SmithSystems AnalystAsked:
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Abhimanyu SuriDatabase EngineerCommented:
Because below mentioned SQL must be returning more than 1 record

select court_date
from js_arraignment_events
where js_arrests.case_id = js_arraignment_events.case_id
and js_arraignment_events.court_date > js_arrests.arrest_date

Assuming, you want the latest court_date as per table js_arraignment_events, please use something like

select court_date from (select court_date
from js_arraignment_events
where js_arrests.case_id = js_arraignment_events.case_id
and js_arraignment_events.court_date > js_arrests.arrest_date
order by court_date_desc) CRT_DT where rownum < 2
0

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
Please review this article I wrote to handle "updates with join":
https://www.experts-exchange.com/articles/1517/UPDATES-with-JOIN-for-everybody.html
0
Janice SmithSystems AnalystAuthor Commented:
Thank you very much for your help! I've accomplished what I needed to do.
0
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Query Syntax

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