Questions tagged [subquery]
SQL term used to describe when a `SELECT` statement is used as part of a larger SQL statement. The larger statement may be DML and is always found within brackets or parenthesis.
716 questions
0
votes
1
answer
42
views
Add another subquery to one with a pivot
Obviously I need to study a lot more.
Erik Darling helped me with a great query to pull latest backup information (below) and Pivot on full and incremental. I wanted to add infor4mation if the backup ...
- 33
0
votes
0
answers
20
views
Variable only resets per row when query has a static IN condition
I have a complicated query. I have a bunch of users. I have a ledger of debits and credits. I want to filter a user's subscribers by how long the subscribers have been negative. To do that I find ...
- 101
0
votes
1
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37
views
using field of subquery in output
Query:
SELECT tbl1field
FROM tbl1
WHERE id = (SELECT t2id
FROM tbl2
WHERE anotherid = (SELECT t3id FROM tbl3 )
)
here tbl3 is having 2 fields : t3id and ...
- 101
0
votes
1
answer
27
views
Get difference in values of second table from IDs in two columns of first table?
Given these two tables:
Table1
id1
id2
224
2341
5234
9394
6243
2342
⋮
⋮
Table2
id
value
224
2
2341
52
2342
24
5234
23
6243
242
9394
99
⋮
⋮
I would like to create this table:
Table3
id1
...
- 103
0
votes
3
answers
57
views
Dynamic column selection in a subquery
I have two tables, one containing polls and the other poll votes, like this (simplified):
CREATE TABLE IF NOT EXISTS polls (
id SERIAL PRIMARY KEY,
token VARCHAR(20)
);
CREATE TABLE IF NOT EXISTS ...
0
votes
0
answers
22
views
Lost connection to MySQL server during query for a not-so-complex long query
I have this query :
SELECT some_15_fields,
(SELECT GROUP_CONCAT(tb_inv_private_ip SEPARATOR ', ') FROM `network_interface`
WHERE network_interface.tb_inv_id=id) as 'private_ip',
(SELECT GROUP_CONCAT(...
- 279
1
vote
3
answers
416
views
Need help rewriting view to avoid using subqueries in MySQL 5.1 db
I am working on creating a view in MySQL for an application that tracks form submissions. There is one particular table that I cannot figure out how to write a query for. It has foreign_keys ...
- 19
0
votes
1
answer
33
views
How to Do a Sub Query and JOIN for Comparison Report
Hi I was trying to do a Sub Query and Comparison Report
For Example, I have a Table of Teams with Color AND Name in a Single Table.
A person can be on more than one Team and Multiple Team Colors can ...
- 101
0
votes
1
answer
127
views
Debug RPC Function Creation in Supabase
I'm pretty new to database stuff.
I'm using Supabase to create an application where I keep track of the number of likes on certain items ('clicks'). I want to filter items either by the date the likes ...
- 3
1
vote
1
answer
154
views
Limiting the number of rows that can be inserted for a given WHERE clause
In Postgres, I want to be able to confirm users' RSVPs for an event that has limited capacity. How do I do this in a way that protects against race conditions?
I have a table event_attendance with ...
- 141
0
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0
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38
views
Performance difference in SQL queries using JOINs with function
I have two SQL queries that are structurally the same, but have a significant difference in execution time.
The first query takes around 500ms to execute, while the second one takes only 50ms.
Both ...
- 33
0
votes
1
answer
42
views
Display in asc order from multiple databases under multiple linked server and add two date parameters so that I can integrate it to my app
I have a script below where it display a result from different databases under different linked Server. The query is just connected or linked thru union all and it seems there's no issue on its result....
0
votes
1
answer
54
views
Combine tables to find date of last value changed
Trying to query the date that a field changed to a zero amount. Here is some of the data from the tables involved:
-- mbMaster is the master table for all 'm' type tables (mvTable, mcTable), but does ...
- 75
2
votes
3
answers
682
views
How can I get an average from a query dataset in SQL Server?
I am building a parts inventory system, and have a transaction table that stores how often an item in used.
Let's say Item A is used 10 times in 2021, 20 in 2022, and 30 in 2023. Of course each ...
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1
vote
2
answers
67
views
Query to return latest record between 2 tables
I'm trying to pull the most current date (cusPurDt) and corresponding amount (subAmt) by customer (cusID/subID). Here is some sample data:
create table customer (
cusID char(5),
cusPurDt ...
- 75
2
votes
1
answer
64
views
Query for single return meeting multiple criteria and values
I'm trying to figure out a way to count an ID once when multiple criteria are met in one column while displaying a total of the same criteria in another column. The criteria for the first column can ...
- 75
1
vote
1
answer
20
views
In MS Studio how to SELECT from an existing SQL file
I have a complicated query that select parts from an MRP table using several different criteria. The output of the query is a list of parts which includes the key field [PartNum]. I have saved this ...
- 11
1
vote
1
answer
38
views
MySQL Tennis Ladder View Creation Question
I am creating a Tennis Ladder VIEW using MySQL and wish to do the following:
Properly create a view that includes: All player's names
These player names will come from the table: User - using the ...
- 21
0
votes
0
answers
32
views
How to use a parameter derived from a Table, given I'm filtering the table in query
The task is to find what fraction of total users have logged in at least for one more consecutive day after their first login.
SELECT
ROUND( COUNT( b.player_id )/COUNT( DISTINCT (SELECT a....
-2
votes
3
answers
63
views
Query to find values based on a like and a not like
I have a column in a table: ID - this column can have a value of '123456' but can also have value '123456x'.
I need to return all the numbers where there is an 'x' and the same number but without an '...
0
votes
1
answer
57
views
Efficient PostgreSQL query syntax for duplicating the result
Assuming I have the following PostgreSQL query:
SELECT (
SELECT SUM (t.customers)
FILTER (
WHERE id = 1
AND date
BETWEEN %(start)s AND %(stop)s
...
- 133
1
vote
0
answers
68
views
Inconsistent result when running same query on slightly distinct MariaDB versions
I'm investigating the difference in the results given by the same SQL query on two servers running slightly different versions of MariaDB (10.5 and 10.11).
Test query is:
SELECT a.Name
FROM Artist a ...
- 111
1
vote
2
answers
88
views
Is there a "correct" way for an optimizer to process a subquery if the outer query has additional where filters?
This topic came up for me as the result of investigating an error in Redshift. We have a table containing a column of numbers represented as text, but for rows where no value is present a single ...
- 111
1
vote
2
answers
93
views
How do I optimize this query that gets the newest entry of each group?
I have a query, that finds the newest item of each group based on the ID returned by a subquery. The problem is, that the table has a bit over 5000 entries and even with only this amount of entries ...
- 13
0
votes
1
answer
103
views
The most recent rows in for each type/agent
I have a table (still on MySQL 5.7) with lots of data. This table is written by some scripts. It works like a "checkin", where each agent is checking in in some period of time. It looks like ...
- 13
0
votes
1
answer
163
views
Calculate (n) workdays from a given date, using a calendar table
As shown on below image, I have two tables;
Customer : with about 4 million records; and 3 columns
[Customer] : Customer ID
[Date] : Creation date
[Num_Days] : Number of working days to calculate ...
- 1
1
vote
1
answer
320
views
Query for repeating sequences in SQLite
I have an SQLite DB, let's assume the id can be considered as the order of rows, I want to find repeating sequences in the table according to certain criteria.
consider this example (http://sqlfiddle....
- 167
1
vote
0
answers
19
views
postgresql sub query
I have three tables
kit - contains kit_id and kit_type (kit type is with android or IOS)
appointment - contains appointment_id, created_datetime, kid_id, created_by_id
user - contains user_id, user ...
- 11
-3
votes
1
answer
130
views
subquery vs join which is better [closed]
SELECT *
FROM
table1
WHERE
t2id in
( SELECT id FROM table2
WHERE t3id =
(SELECT id FROM table3 WHERE id = '1') );
SELECT * ...
- 97
1
vote
1
answer
1k
views
Return Subquery with Multiple Columns as JSON Array of JSON Objects
In my setup, the relevant tables for this problem are:
Items
Users
Collections (of Items) — each user can have multiple
Collection Items — where I track what items are in each collection.
The items ...
- 121
0
votes
1
answer
65
views
Why the following first of two queries in MSSQL is faster as I want the second one?
1st Query: result 32 seconds (1,758,220 rows)
SELECT
CAST(ID.PYYY AS varchar(8))+','+
CAST(ID.SYYY AS varchar(8))+','+
(
SELECT TOP 1 (
CAST(IMM.INVOICE_DATE1 AS varchar(8))+','+
CAST(...
- 101
2
votes
2
answers
556
views
How to update a foreign key with random values from the referenced table?
In order to generate test data for a Postgres database, I want to update a foreign key in a table, let's say 'users' with random values from the referenced table, let's say 'shift'.
How to do it?
I ...
0
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0
answers
18
views
Why SQL subquery returns no error on trying to select not existing column? [duplicate]
I use PostgreSQL 15 and have two tables:
table 1 has only one column id1 (pkey) and has 6 rows (values 1-6)
table 2 has only one column id2 (pkey) and has 6 rows with some another values
Then I try ...
- 1
0
votes
1
answer
73
views
Compose a complex query in Postgresql
I have a huge table like following:
CREATE TABLE public.huge_table (
sampl_day date NOT NULL,
tick_time timestamp(6) with time zone NOT NULL,
crit_feat integer NOT NULL,
---
--- ...
- 359
1
vote
1
answer
476
views
How to return list of content from subquery for the main query?
I have a create that have sub query. To show as example, here is a query that has similarity with my own. Personally I have more table and more arguments on table (The subquery have left join for ...
- 181
4
votes
1
answer
14k
views
postgres - copy values from one column to another column (same table)
I want to copy the entire content from one column to another (same datatype) and thought of a subselect to be part of the equasion.
UPDATE tab01
SET column2=(SELECT column1 FROM tab01);
ERROR: ...
- 215
1
vote
0
answers
25
views
query customer retention over range
I am trying to find the best way to accomplish the following.
Get the beginning customer count, which carries from the previous day
Get New Customer count
Get the number of Customers who have not ...
- 111
1
vote
2
answers
92
views
MySQL with subquery becomes slow
I have 3 MySQL tables: products, orders and users.
I want to show all ordered products where not all products are "pre-orders" or "discounts". Note: one user can have multiple ...
1
vote
1
answer
162
views
Combining Multiple queries from the same table inrto 1 query
I am looking to find a way to achieve the below...
I have tried using Joins and SubQueries but no joy as yet...
I have a table that keeps track of wins/loses/draws as so
Date
WLD
01/01/23
Win
05/01/...
- 43
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votes
2
answers
112
views
Using a WHERE colname NOT LIKE (select * from otherTable)
So in essence what im trying to do is this:
Given TBL1 (around 8,000 rows)
letters
abababa
bcbcbcb
cdcdcdc
and TBL2 (around 2,000 rows)
letters
ab
bc
I want to write a query to find every row ...
0
votes
1
answer
435
views
Join result of crosstab to main query
I'm trying to get this column structure:
| id | name | main_image | rating | shop_names | prices | urls | 2 | 3 |
My table structure looks like this
CREATE TABLE products (
id SERIAL PRIMARY KEY,
...
3
votes
3
answers
11k
views
"ERROR: column "a" does not exist" when referencing column alias
I am attempting to retrieve either a null or boolean value from a query. Here is my query:
SELECT EXISTS (SELECT 1 FROM employee
where add_uuid = '7e53fa47-ade3-4e94-8efd-b25f998b09c6') ...
- 133
1
vote
1
answer
498
views
Parallel index-only scan with two sub-queries is slow
I'm trying to analyze a slow query that uses parallel index-only scan of two filters (using sub-queries). Specifically I'm the number of 'open_questions' that returned by either subplan1 OR subplan2.
...
- 135
0
votes
2
answers
57
views
I have a database with a player, tournament, and registration table. I need to query all players that played in 2 types (attributes) of tournaments
I currently have two tournaments that have matches. Wimbledon and Atlanta open which I have one as a grand slam and the other as a masters 1000, and I want to get the players who played in both
This ...
2
votes
2
answers
96
views
DB2 query not working
Customer (parent table)
Id
Charge Amt
C1
10
C2
20
C3
30
C4
40
Payment (child table)
Id
pymt amt
C1
10
C2
5
C4
40
Select Id and pending balance from customer and payment tables
Pending ...
- 21
1
vote
1
answer
162
views
DIV and GROUP by issues
I have one query, made it in MySQL.
And now try to run on PostgreSQL, but get syntax error twice.
Once on the DIV command, and then on the GROUP BY.
Here is my code:
UPDATE status_table
SET Status_CG ...
2
votes
1
answer
74
views
How to calculate latlong difference from last 15 min ago and last 1 min ago without using correlation subqueries
Problem
I would like to find logs that are active and do not hit a distance quota of 12.5km, comparing from last 15 min ago and latest (within last 1 min ago)
Sample data
select version();
version()
...
- 79
0
votes
1
answer
515
views
How do I filter a set of child records to get a single child record for each parent? [duplicate]
Sorry if it's a simple question but I can't wrap my head around it. I have two tables, users and carts. For each user record I need to get it's most recent cart (ordered by created_at desc).
I've ...
- 103
0
votes
1
answer
120
views
optimization with subquery not working as expected
I have a MySQL InnoDB database. One table called affymetrixProbeset contains more than 300 million rows.
Querying this table with INNER JOIN to other tables, with an ORDER BY and offset/limit takes ...
0
votes
2
answers
773
views
Postgres sort results by id's from subquery
In postgres 11 im implementing something in type of suggesting new tag for user. To achieve that im first counting amount of activities of specific user in specific category. Query looks as follows
...
- 15