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You probably mean ts2.user_id not ts2, user_id, right? Best regardsHolger Friedrich From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Greg SpiegelbergSent: Friday, April 24, 2015 3:07 PMTo: pgsql-general@postgresql.org >> PG-General Mailing ListSubject: [GENERAL] COALESCE woes Hi PG List, I'm missing something or haven't had enough coffee yet. What gives with the COALESCE in the view below? mxl_sqr=# \d users Table "public.users" Column | Type | Modifiers---------+---------+----------- user_id | integer | not nullIndexes: "users_pkey" PRIMARY KEY, btree (user_id) CREATE TABLE ts1 ( user_id int references users(user_id), ts timestamptz default now()); CREATE TABLE ts2 ( user_id int references users(user_id), ts timestamptz default now()); CREATE TABLE ts3 ( user_id int references users(user_id), ts timestamptz default now()); CREATE OR REPLACE VIEW user_timestampsASSELECT COALESCE(ts1.user_id, ts2,user_id, ts3.user_id) AS user_id, max(ts1.ts) AS ts_x, max(ts2.ts) AS ts_y, max(ts3.ts) AS ts_z FROM ts1 LEFT JOIN ts2 USING (user_id) LEFT JOIN ts3 USING (user_id) GROUP BY 1;ERROR: COALESCE types integer and ts2 cannot be matchedLINE 3: SELECT COALESCE(ts1.user_id, ts2,user_id, ts3.user_id) AS us... ^ All types match from start to finish. Thanks,-Greg
You probably mean ts2.user_id not ts2, user_id, right?
Best regards
Holger Friedrich
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Greg SpiegelbergSent: Friday, April 24, 2015 3:07 PMTo: pgsql-general@postgresql.org >> PG-General Mailing ListSubject: [GENERAL] COALESCE woes
Hi PG List,
I'm missing something or haven't had enough coffee yet. What gives with the COALESCE in the view below?
mxl_sqr=# \d users Table "public.users" Column | Type | Modifiers---------+---------+----------- user_id | integer | not nullIndexes: "users_pkey" PRIMARY KEY, btree (user_id) CREATE TABLE ts1 ( user_id int references users(user_id), ts timestamptz default now()); CREATE TABLE ts2 ( user_id int references users(user_id), ts timestamptz default now()); CREATE TABLE ts3 ( user_id int references users(user_id), ts timestamptz default now()); CREATE OR REPLACE VIEW user_timestampsASSELECT COALESCE(ts1.user_id, ts2,user_id, ts3.user_id) AS user_id, max(ts1.ts) AS ts_x, max(ts2.ts) AS ts_y, max(ts3.ts) AS ts_z FROM ts1 LEFT JOIN ts2 USING (user_id) LEFT JOIN ts3 USING (user_id) GROUP BY 1;ERROR: COALESCE types integer and ts2 cannot be matchedLINE 3: SELECT COALESCE(ts1.user_id, ts2,user_id, ts3.user_id) AS us... ^
mxl_sqr=# \d users
Table "public.users"
Column | Type | Modifiers
---------+---------+-----------
user_id | integer | not null
Indexes:
"users_pkey" PRIMARY KEY, btree (user_id)
CREATE TABLE ts1 (
user_id int references users(user_id),
ts timestamptz default now()
);
CREATE TABLE ts2 (
CREATE TABLE ts3 (
CREATE OR REPLACE VIEW user_timestamps
AS
SELECT COALESCE(ts1.user_id, ts2,user_id, ts3.user_id) AS user_id,
max(ts1.ts) AS ts_x,
max(ts2.ts) AS ts_y,
max(ts3.ts) AS ts_z
FROM ts1
LEFT JOIN ts2 USING (user_id)
LEFT JOIN ts3 USING (user_id)
GROUP BY 1;
ERROR: COALESCE types integer and ts2 cannot be matched
LINE 3: SELECT COALESCE(ts1.user_id, ts2,user_id, ts3.user_id) AS us...
^
All types match from start to finish.
Thanks,
-Greg
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