Home Search Pricing Get inErrata About

Sign in Sign up

Graph/cluster-105

ClusterConcept

SQL Semantics Misplacement

cluster-105

Predicate placement and null/limit semantics get misapplied in SQL, causing UPDATE targets, NOT IN filtering, and existence checks to behave unexpectedly across DBMSs, while small type/quoting issues further corrupt row selection and results.

Node Details

Public graph metadata

Updated6/9/2026

PageRank0.0007

Connections

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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`.

INSTANCE_OFProblem

I have a `ColumnDef` like this:. Outcome: You should change the columns definition by a function instead an array.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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].

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

jq: error: syntax error, unexpected '[', expecting FORMAT or QQSTRING_START. Tension: support for chained `.[]` was added in jq 1.7. Outcome: ubuntu-22.04 Actions runners use jq 1.6.

INSTANCE_OFProblem

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?

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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;.

INSTANCE_OFProblem

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

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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`.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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?

INSTANCE_OFProblem

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

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

I want to create a query that allows me to aggregate 'Total' if 'Codes' contains any one of the values in an array. — 'Codes' is a varchar column. Tension: What should be the appropriate query?

INSTANCE_OFProblem

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

INSTANCE_OFProblem

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?

INSTANCE_OFProblem

Some part of my code inserts a class Entity into DB, where column partitions has type JsonB — when I try to insert `Entity` to db using npgsql.

INSTANCE_OFProblem

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?

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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`.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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`.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

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.

INSTANCE_OFProblem

ERROR: missing FROM-clause entry for table cte — SELECT cte.type, t.* FROM UNNEST(cte.foos, cte.bars) AS t(foos, bars).

INSTANCE_OFProblem

The same code can be run in parallel in multiple threads, or even in multiple Kubernetes pods — DELETE FROM my_table WHERE ctid IN ( SELECT ctid FROM my_table WHERE some_condition LIMIT 1 ). Tension: two threads start fighting for the same record.

INSTANCE_OFProblem

ERROR: insert or update on table "course_content" violates foreign key constraint "coursedetail_fk" — INSERT INTO Course_Content(id, section_title) values (id, 'A pretty awesome crash course');. Tension: Key (id)=(1) is not present in table "course_detail". Outcome: Adding this extra column allows the id to point to whatever and not be constrained by the rules of the `SERIAL` data type.

INSTANCE_OFProblem

Maintain a contiguous ordering in a PostgreSQL table when inserting or deleting rows by an integer column (e.g., questionOrder), such that items at/after a position shift appropriately.

INSTANCE_OFProblem

my goal is to get greatest value for each row — I use PostgreSQL and my goal is to get greatest value for each row. Tension: is there a way i can know which column these values are belong to? Outcome: Expected smth like: id greatest column.

INSTANCE_OFProblem

Two string constants that are only separated by whitespace with at least one newline are concatenated — in PostgreSQL. Tension: I have been trying to determine if the second form, where the `||` string concatenation operator is omitted, is officially supported. Outcome: This slightly bizarre behavior is specified by SQL; PostgreSQL is following the standard.

[inerrata]Tags Knowledge Graph Docs About Pricing Contact Report a Bug Privacy Terms Cookie Settings Do Not Sell or Share My Info

© 2026 Inerrata

SQL Semantics Misplacement - inErrata Knowledge Graph | Inerrata