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Graph/cluster-74

ClusterConcept

Query Shape Drift

cluster-74

SQL and DSL query shapes drift from the intended semantics because callers vary where logic lives (inner SELECT vs outer UPDATE, record vs POJO mapping, loop control vs LIMIT), leading to missing/extra rows and hard-to-debug execution results.

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Updated6/23/2026

PageRank0.0000

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50 linked nodes

INSTANCE_OFProblem

PostgreSQL does not support LIMIT directly in UPDATE statements. — When implementing batch updates (e.g., promoting memory events from short-term to long-term with a batch cap),. Tension: you need a subquery pattern.

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replaces the entire column value when a patch is provided — Using `COALESCE($1::jsonb, column)` in a PostgreSQL UPDATE to "patch" JSONB columns. Tension: Existing keys not present in the patch are lost. Outcome: This breaks any system that expects partial JSONB updates.

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I can get the same performance issues with either a select or a delete — they join two tables, and none of the join conditions compares using `=`. Tension: `IS NOT DISTINCT FROM` is not supported by indexes, and `OR` is usually a performance problem anyway. Outcome: the root of your problem are the NULL values.

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sqlc always generates a struct with an `interface — I’ve tried several approaches. Tension: I need to aggregate more complex data into a slice. Outcome: Composite and record types aren't yet supported by `sqlc`.

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you can't use $1 parameters to replace any part of sql query. Tension: It can be use for parameters values only. Outcome: Will give an error because we trying to replace table and column name with parameters.

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When any source table had zero rows, that table was silently absent from the result — A dashboard query unioned several content tables into a CTE then GROUP BY'd the table_name to emit one summary row per table. Tension: one summary row per table.

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cannot adapt type 'dict' using placeholder '%s' (format: AUTO) — running query below query i'm getting error. Tension: I want check whether the particular email template is used in any other model instance and model Rule we have action(JSONB). Outcome: Rather than trying to construct a JSON literal in SQLAlchemy you could let Postgres do it using the `jsonb_build_object` function.

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GET /elements/?skip=0&limit=10&services=Test. Tension: the filter does not work as expected. Outcome: FROM elements WHERE (elements.services LIKE '%%' || %(services_1)s || '%%')) AS anon_1].

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does not populate by query — retrieve via query results from two related tables via a third mid table. Tension: It's a relationship between Product - Category via ProductCategory join.

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I'm trying to convert a SqlAlchemy Join Query to JSON, such that the columns from both joined tables are reflected in the output. — SqlAlchemy Join Query. Tension: All the solutions I've been able to find are only able to reflect the columns from a single table, or to only reflect a single relationship rather than the full one-to-many relationship.

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when I use Data Conversion Parameters like `EMPTYASNULL` it loads both blanks and nulls as NULL — load blank values as blank and null values as null from a CSV using COPY command in Redshift. Tension: I am expecting blank value in the column for row (with extra='B') but seems like every thing is loaded as null. Outcome: How do I make it blank?

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it creates a single table "mongodb_attempts" — I've created a crawler with data source `.../hist/mongodb/mongodb_attempts/`. Tension: instead of creating a table for each attempts_YYYYMMDD.

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does not produce such a `query_profile.json` file — If you run an `EXPLAIN` or `EXPLAIN ANALYZE` query. Tension: profiling/timing stats to a `query_profile.json`, which I should be able to use to generate an html file. Outcome: the profiling information will not be written to the desired file, but will rather show up in the result.

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the `imagesCollection.items` array only returns one image object — GraphQL query in my code. Tension: multiple images are associated with the room. Outcome: Tested the query in the Contentful GraphQL Playground: It returns all the images correctly.

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indexes by Seq Scan — Tried to set db_index=True, HashIndex and BrinIndex. Tension: there are 1000 records in the database. Outcome: 1000 records is very small amount of records.

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How can I write this using jOOQ version 3.15.5 ? — SELECT organisation_id, count((j->>'invoiceId')) AS count, sum((j->>'advanceAmount')::numeric(20,4)) AS sum FROM runs LEFT JOIN jsonb_array_elements(invoices) j on true GROUP BY organisation_id;.

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Selecting a more optimal index for a PostgreSQL query that filters on multiple fields inside a JSONB column

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related_player_id 12 non-null float64 — trying to load it to a Postgres database. Tension: This has been fine for most of the tables, but the final assignment table is causing me problems. Outcome: bigint out of range.

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will a transaction log only be created on difference, or even if it's the same value? — use the `MERGE INTO` statement in PostgreSQL 16 with the `WHEN MATCHED THEN UPDATE SET` option. Tension: I'm concerned about rapid disk space growth.

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A PostgreSQL query uses a CTE to select the old session_id and then performs an INSERT ... ON CONFLICT DO UPDATE, returning the CTE’s result as the previous value. The user needs to know whether PostgreSQL guarantees the CTE is evaluated before the INSERT/UPDATE so the returned value is correct.

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as long as the `realm_id` has a name which status is neither `closed` nor `denied`, it'll be marked as `active`, otherwise, it's `inactive` — aggregate based on `realm_id` first;. Tension: I've tried to use aggregate and left outer join, but no luck thus far. Outcome: You can use `bool_or()` aggregation function.

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none of the three queries you showed ended up using it — Select * from users where Type = 'SomeType' and First = 'SomeName1' Order by CreatedAt DESC;. Tension: The fact that you're selecting and ordering by `CreatedAt` doesn't mean it's needed as an index key. Outcome: If you simply remove `createdat` from the index, they're happy to use it for a Bitmap Index Scan taking below `5ms`.

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table "location_array" has 1 columns available but 2 columns specified — FROM unnest(locations) AS location_array(lng, lat). Tension: trying to access slices - there's colon `:` syntax for that.

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ERROR: duplicate key value violates unique constraint "orders_pkey" — using a LEFT JOIN with WHERE o.order_id IS NULL. Tension: This query should only insert `order_id`s that do not already exist in `orders`. Outcome: Use ON CONFLICT DO NOTHING.

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I want to check if Value_Name with Value exists in any of the elements in Inner array — I have an PostgreSQL database with complex JSON structures. Tension: I think I should be able to do it with the `@>` operator but can't seem to get it working. Outcome: Can anyone suggest what I can do search the array?

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heavy parallel inserts (INSERT INTO ... SELECT ...) could slow down due to SEQUENCE contention — in Greenplum, SEQUENCE is managed globally by the master node. Tension: multiple segments request new IDs in parallel.

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psql reports a syntax error when using :myVar inside a PostgreSQL DO block

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ERROR: relation "dok_during_exclude" already exists — alter table dok add constraint dok_during_exclude EXCLUDE USING gist (pais2obj WITH =, during WITH &&).

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syntax error at or near "ASC" — ORDER BY priority DESC NULLS LAST, CASE WHEN 1 = 1 THEN created_at ASC ELSE created_at DESC END;. Tension: How can I have `CASE` in the second key of the `ORDER BY`? Outcome: This throws an error.

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When I try do drop the column it times out after 20 mins. — I have a very large table (over a TB space) in a postgres db and it has a text column which is also large causing TOASTING in the db. Outcome: I am getting an error stating the statement is canceled due to timeout.

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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 ?

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Now I want to keep only the rows where we have multiple times the same ID and Name combination. — using the row_number() functon to identify duplicates, partitioned by ID and Name. Tension: the third, fourth and last row should be removed. Outcome: How can this be done?

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figure out which statement from the block is currently running in Postgres. Outcome: The simple solution is to throw in, at positions you want to know ...

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I want to calculate the average score of each row — removing one of the highest and one of the lowest scores. Tension: The following is the method I use. It is very bloated and the execution time is too long. Outcome: So I would like to ask if there is a neat way to achieve my needs?

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The following is the method I use. It is very bloated and the execution time is too long. — especially if there are more score columns(score8, score9...), more `UNION ALL` will be piled up.

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to get the price for each entry in descending order according to price. — If an entry has more than one parent key for 'price'. Tension: If an entry has more than one parent key for 'price', select the larger of the two.

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Hibernate send multiple statement in the same time and not merging them into multi-valued INSERT — When you set batch_size > 1. Tension: I was unable to find any official documentation on such INSERT statement merging. Outcome: it looks like this feature does exist and I just haven't quite managed to get it to work.

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how to get cumulative count? — In postgresql. Tension: I wanted to get a cumulative count of customers enrolled between 01-01 and 02-01, 01-01 and 03-01, 01-01 and 04-01 etc. Outcome: ideally the output should be like.

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update node set version = version + 1 where id = 'id1'; -- should delete the edge; instead [23503] ERROR: update or delete on table "node" violates foreign key constraint "edge_id1_version1_fkey" on table "edge" — build a graph-like data structure in PostgreSQL. Outcome: delete any `edge` referencing the updated `node`.

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I would like to get something like this: — select all the usernames that end with the suffix in one column, matching the users that have the "dbname_suffix" pattern in their usernames with a second column where I have databases.

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I saw this value is empty in case of logical replication — There is xmin parameter in replication slot. Tension: it is clear that logical slots does not help in preventing vacuum process of dead tuples required by select queries on standby. Outcome: Logical replication slots have `catalog_xmin`.

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I want to pivot this datasets from rows to columns. — timeseries data. Tension: This means in each row one complete dataset.

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a delete operation was performed within the 'conferences' table, and due to the cascade delete, it also deleted the information in the 'orders' table — I have a PostgreSQL database. Tension: I would like to know if there is any way to recover this data, considering that I don't have a backup of this information. Outcome: Once delete executed in PostgreSQL database, you have very little to no chances to recover your data without backup.

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jsonb_path_query() is failing when given the output of a SQL function that returns a JSON string, because the target argument type does not match the required jsonb type.

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sequence [ID_SEQ] defined inconsistent increment-size; found [1] but expecting [100] — Quarkus postgres and liquibase. Tension: those values are inconsistent. Outcome: You have to annotate fields(ex: id) with `sequenceGenerator` not the Entity or class.

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need to check the type of a given object — I'm working on a PostgreSQL database. Tension: Currently, I'm using multiple queries and conditions to determine the object type.

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So far I can get both groups valid and invalid if tomato appears in the set. — I have a set of data that I group by "product_group_id", "group_name" and "class". Tension: I want to check the "name" list and if "tomato" name exists in the set I will add "invalid" value or "valid" to the new "label" column. Outcome: You need to use an aggregated function e.g. `max` to check the tomato and not group by on the `label`.

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I am getting the dates in 2 different format — I am working on a data movement where the source is MongoDB and target is Redshift. Outcome: tried using the regex to remove the string part in the format1 and apply the same logic for the upcoming data as well but I am unable to get the correct query.

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The data will get removed from the index by some future vacuum. — Does PostgreSQL remove values from partial index if conditon is no longer met? Tension: freed up space is only reusable under one of two conditions. Outcome: you would need a REINDEX.

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The query uses json_to_recordset on a single JSON document, but it needs to work over multiple JSON documents stored in a table. As written, it cannot return results across all table rows.

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