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Updated4/30/2026

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weaviate-client

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in which the query above is nested. Tension: why is it a must to alias in the second query and not the first ?

RELATES_TOSolution

You can choose the bootstrap user name when you create the cluster: — initdb -U fuzzy -E UTF8 --locale=en_US.utf8 /path/to/data/directory. Tension: But you can also rename the user any time later:. Outcome: ALTER ROLE postgres RENAME TO fuzzy;.

RELATES_TOProblem

canceling statement due to statement timeout — the below query is timing out due to large data set. Tension: I appreciate any suggestions on how to increase the below query performance.

RELATES_TOSolution

Personally I would go for this: — the below query is timing out due to large data set. Tension: you really should provide the full EXPLAIN ANALYZE result otherwise we're just flying blind and guessing here.

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Check your `current_logfiles` file — to see what your db knows about where it's currently supposed to save logs. Outcome: select pg_read_file('current_logfiles');.

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If that is still not enough, perhaps it helps to start cleanup earlier — If that is still not enough. Tension: autovacuum may run for days and not complete in time. Outcome: This is done by lowering `autovacuum_multixact_freeze_max_age` for that table.

WRITTEN_INSolution

Use regex extraction and cast matched numbers to NUMERIC for ordering

WRITTEN_INSolution

select string_to_array(code, ',') as array_codes, total from raw_data — where array_codes && array ['5', '7'];. Outcome: select sum(total) as sum_total.

WRITTEN_INSolution

alter table test add column txt_tsv tsvector generated always as (to_tsvector('english',txt)) stored; — retrieve all rows from a PostgreSQL database that contain sentences similar to a provided string. Tension: I attempted to use the fuzzy matching functionality available in PostgreSQL, but it didn't produce the desired results for me. Outcome: where txt_tsv @@ plainto_tsquery('the quick brown fox jumps over the lazy dog');.

WRITTEN_INSolution

Do you want ILIKE searches? If so, then you should do that. — for searches less than 3 characters. Tension: Maybe you should use `%` but with a different threshold. Outcome: Maybe you should use `%` but with a different threshold.

WRITTEN_INSolution

First create a new table, to store some metadata — execute a function of operation to stamp access statistics before and after the business workflow. Tension: maybe is not has graphical representation with table visualizer and start or stop capabilities. Outcome: it does the job.

WRITTEN_INSolution

That can be solved using a regular expression like: — select substring(ID, '(^[A-Z]{2}\.[A-Z]{1}(\.UP|\.DOWN)*)') from table1;. Outcome: select substring(ID, '(^[A-Z]{2}\.[A-Z]{1}(\.UP|\.DOWN)*)') from table1;.

WRITTEN_INSolution

I want to retain the discrete event scoring, but also rank the racer in the series. Tension: if there are legitimate ties across different racers, I want there to be gaps in the rank. Outcome: The easiest way to solve this I think would be to issue two queries, one with the "duplicate" racers eliminated, and then a second one where I can retain the individual race data.

WRITTEN_INSolution

start_hour2 and end_hour2 could be null as well. Tension: How do I check if the timestamp is not between (start_hour1 and end_hour1) and (start_hour2 and end_hour2). Outcome: or just pure and simple `BETWEEN`.

WRITTEN_INQuestion

Postgres query is slow with LIKE search on large table

WRITTEN_INQuestion

PostgreSQL partial index not used by planner with OR IS NULL predicate

WRITTEN_INSolution

Added `payload jsonb` column to `channelEvents` for non-status event types. Tension: This mirrors the existing presence notification pattern but uses `statusType: 'broadcast'` and stores `{ taskSubject, taskStatus, message? }` in the payload column. Outcome: Added `...event.payload ?? {}` spread and added `fromHandle` as a separate key alongside `handle`.

PERTAIN_TORootCause

subprocess.CalledProcessError: Command '\['pg_dump', '-h', 'source_postgres', '-U', 'postgres', '-d', 'source_db', '-f', 'data_dump.sql', '-w'\]' returned non-zero exit status 1 — The following error comes from my Python script. Tension: I've been trying to figure this out for a long time, and can't find a solution.

PERTAIN_TORootCause

table "location_array" has 1 columns available but 2 columns specified — unnest(locations) AS location_array(lng, lat). Tension: there's colon `:` syntax for that. Outcome: This effectively unpacks the values from the first column of your 2d array in pairs with those from its second column.

PERTAIN_TORootCause

there is no variable substitution in string literals — The body of the `DO` statement is a dollar-quoted string literal.

PERTAIN_TOSolution

With `psql`, you could use `\gexec` — The body of the `DO` statement is a dollar-quoted string literal. Outcome: the result of the `SELECT` statement (the `DO` statement) will be executed.

PERTAIN_TORootCause

Try putting semi-colons between the items in the connection string — HostName=localhost;PortNumber=5432;LogonID=carsUser; Password=[your_password]; Database=the-new-cars;. Outcome: Database=the-new-cars.

PERTAIN_TOSolution

Other than `coalesce(col1, 0) + coalesce(col2, 0)` — do null safe addition. Tension: is there any built in shorthand function, like `least`, that will let me do null safe addition? Outcome: There is nothing built in, but you can create your own:.

PERTAIN_TOSolution

Try a combination of `LEFT JOIN` and `RIGHT JOIN` with a `UNION` to cover all the cases — retrieve matching and non-matching database names and user roles with a specified suffix, ensuring to exclude specific system databases. Outcome: I combined `LEFT JOIN`, `RIGHT JOIN`, and `UNION` to retrieve matching and non-matching database names and user roles.

PERTAIN_TORootCause

group by r.product_group_id, r.group_name, r.class, label — case when r.name='tomato' then 'invalid' else 'valid' end label. Outcome: case when max(case when r.name ='tomato' then r.name end) = 'tomato' then 'invalid' else 'valid' end label.

PERTAIN_TOSolution

You need to use an aggregated function e.g. `max` to check the tomato — select r.product_group_id, r.group_name, r.class, case when max(case when r.name ='tomato' then r.name end) = 'tomato' then 'invalid' else 'valid' end label. Tension: not group by on the `label`. Outcome: group by r.product_group_id, r.group_name, r.class.

PERTAIN_TORootCause

In SQL Server we had the SQL Server profiler — start recording, perform the action and then stop the recording. Tension: All activities were listed and with some simple or complex filters we could find out those tables. Outcome: but instead to a group of functions/queries/tables.

PERTAIN_TOSolution

Avoiding duplicates requires a table constraint like: — Concurrency. Tension: you run the risk of getting duplicates. Outcome: UNIQUE (auction_id, max_bid).

PERTAIN_TOSolution

That can be solved using a regular expression like: — select substring(ID, '(^[A-Z]{2}\.[A-Z]{1}(\.UP|\.DOWN)*)') from table1;. Outcome: select substring(ID, '(^[A-Z]{2}\.[A-Z]{1}(\.UP|\.DOWN)*)') from table1;.

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