Thread: UPDATE from CTE syntax error
Good evening,
I am struggling with the syntax, please help.
This query with a CTE works ok:
WITH extract_letters AS ( SELECT mid, STRING_AGG(x->>'letter', '') AS letters FROM ( SELECT mid, JSONB_ARRAY_ELEMENTS(tiles) AS x FROM words_moves WHERE action='play' ) z GROUP BY mid) SELECT * from extract_letters;
mid | letters
--------+---------
12 | АКЖОЛ
15 | ДМО
16 | ТО
20 | ШГА
21 | КТИ
22 | ВОЗ
24 | АКПОНК
But UPDATEing from the CTE does not -
WITH extract_letters AS ( SELECT mid, STRING_AGG(x->>'letter', '') AS letters FROM ( SELECT mid, JSONB_ARRAY_ELEMENTS(tiles) AS x FROM words_moves WHERE action='play' ) z GROUP BY mid) UPDATE words_moves m SET m.letters = el.letters FROM extract_letters el WHERE m.mid = el.mid;
ERROR: 42703: column "m" of relation "words_moves" does not exist
LINE 14: SET m.letters = el.letters
^
I am struggling with the syntax, please help.
This query with a CTE works ok:
WITH extract_letters AS ( SELECT mid, STRING_AGG(x->>'letter', '') AS letters FROM ( SELECT mid, JSONB_ARRAY_ELEMENTS(tiles) AS x FROM words_moves WHERE action='play' ) z GROUP BY mid) SELECT * from extract_letters;
mid | letters
--------+---------
12 | АКЖОЛ
15 | ДМО
16 | ТО
20 | ШГА
21 | КТИ
22 | ВОЗ
24 | АКПОНК
But UPDATEing from the CTE does not -
WITH extract_letters AS ( SELECT mid, STRING_AGG(x->>'letter', '') AS letters FROM ( SELECT mid, JSONB_ARRAY_ELEMENTS(tiles) AS x FROM words_moves WHERE action='play' ) z GROUP BY mid) UPDATE words_moves m SET m.letters = el.letters FROM extract_letters el WHERE m.mid = el.mid;
ERROR: 42703: column "m" of relation "words_moves" does not exist
LINE 14: SET m.letters = el.letters
^
Regards
Alex
Oops, I am sorry for the formatting - Mac + Terminal + Gmail :-/
On 05/26/2018 09:21 AM, Alexander Farber wrote: > Good evening, > > I am struggling with the syntax, please help. > > This query with a CTE works ok: > > WITH > > extract_letters AS ( > > SELECT > > mid, > > > STRING_AGG(x->>'letter', '') AS letters > > FROM ( > > SELECT > > mid, > > > JSONB_ARRAY_ELEMENTS(tiles) AS x > > FROM words_moves > > WHERE action='play' > > ) z > > GROUP BY mid) > > SELECT * from extract_letters; > > mid | letters > --------+--------- > 12 | АКЖОЛ > 15 | ДМО > 16 | ТО > 20 | ШГА > 21 | КТИ > 22 | ВОЗ > 24 | АКПОНК > > But UPDATEing from the CTE does not - > > WITH extract_letters AS ( > > SELECT > > mid, > > > STRING_AGG(x->>'letter', '') AS letters > > FROM ( > > SELECT > > mid, > > > JSONB_ARRAY_ELEMENTS(tiles) AS x > > FROM words_moves > > WHERE action='play' > > ) z > > GROUP BY mid) > > UPDATE words_moves m > > SET m.letters = el.letters I would say the above is the problem: https://www.postgresql.org/docs/10/static/sql-update.html "column_name The name of a column in the table named by table_name. The column name can be qualified with a subfield name or array subscript, if needed. Do not include the table's name in the specification of a target column — for example, UPDATE table_name SET table_name.col = 1 is invalid. " So it should be: SET letters = el.letters > > FROM extract_letters el > > WHERE m.mid = el.mid; > > ERROR: 42703: column "m" of relation "words_moves" does not exist > LINE 14: SET m.letters = el.letters > ^ > > Regards > Alex -- Adrian Klaver adrian.klaver@aklaver.com
On Sat, May 26, 2018 at 6:37 PM, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
https://www.postgresql.org/docs/10/static/sql-update.html
"column_name
The name of a column in the table named by table_name. The column name can be qualified with a subfield name or array subscript, if needed. Do not include the table's name in the specification of a target column — for example, UPDATE table_name SET table_name.col = 1 is invalid.
"
So it should be:
SET letters = el.letters
Thank you Adrian, this has worked