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Inconsistent results with MySQL, query never ends on MariaDB

We have some really strange behaviour on MySQL (8.0.29) that we can't explain. We have 2 tables + 1 link table in-between, illustrated by this schema : We run a query whereby we need to fetch the id ...
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  • 109
1 vote
2 answers
182 views

Postgres slow exists subquery

I have a queue system that has two tables, jobs and jobs_queues. jobs is where we put jobs to run and job_queues we populate with queue names so that when we pick jobs we can discard those that are ...
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0 votes
1 answer
26 views

Return all archive records when any one record meets criteria

I want to get all archive records related a transfer ID where at least one archive record has a date in the report month (in this case September). The Archive Table SELECT PTA.PlnndTrnsfrID, PTA....
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  • 11
-1 votes
2 answers
30 views

MYSQL get rows not axisting in other table

I have two tables with 1 identical data column for comparison. One table "species" is a wide list of species and each data row has one unique id called "suid" add. to its primary ...
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1 vote
3 answers
81 views

NOT EXISTS with two subquery fields that match 2 fields in main query

Background: Two different document types in a document management system. Both Doc Type A and Doc Type B have a Ticket #, and a Ticket Date. What we're looking for: Doc Type A docs that don't have a ...
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3 votes
3 answers
3k views

How does SQL Server process DELETE WHERE EXISTS (SELECT 1 FROM TABLE)?

The below is a valid TSQL statement. But I want to understand how SQL Server processes it. DELETE A FROM table1 WITH (NOLOCK) WHERE EXISTS ( SELECT 1 FROM table2 B WITH (NOLOCK)...
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  • 31
1 vote
2 answers
50 views

Select where combined with exists

Table dating_users: user_id | username ---------+---------- 11 | taimoor 13 | jacob 14 | pi (3 rows) Table dating_likes: like_id | user_id | liked_user ---------+---------+--------...
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0 votes
2 answers
251 views

How to check existence in Oracle without scanning the entire table?

Normally, to check existence in Oracle I will do: SELECT COUNT(1) FROM foo WHERE bar = 'baz' However, if the foo table contains multiple rows where bar='baz', this query needlessly scans through the ...
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2 votes
1 answer
144 views

Caveats of OUTER JOIN on nested JSON value

I'm writing a query which is supposed to find the elements from a list which DO NOT exist in the DB. My first attempt at this was to use a nested query where the first query fetches the ids, then I ...
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  • 151
0 votes
1 answer
61 views

Optimise XOR search on int list

I have a large table (TableA) with approx. 120 mio. datasets. This table contains a single primary key column (type: int). Another large table (TableB) contains the same ID column with some other ...
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  • 103
0 votes
4 answers
61 views

How to visualize joins between inner queries to their respective outer queries?

I seem to always have trouble visualizing what the meaning is when an inner query is joined to it's outer query. Here's an example: SELECT NM.MovieId, NM.MovieTitle FROM NinjaMovies AS NM WHERE ...
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3 votes
1 answer
49 views

Help filtering out records in MYSQL

I hope that someone can help me. I need to search to filter out values in a database. The database has about 14 000 records of Koalas that have come into care. Each Koala has their own name with a ...
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1 vote
1 answer
2k views

Unexpected results from MariaDB IF EXISTS ... THEN

I am having unexpected results from MariaDB IF EXISTS... in a stored procedure. I created a minimal example to demonstrate the issue: PROCEDURE testdb.testSearchResults(IN pParam1 INT, IN pParam2 ...
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4 votes
2 answers
144 views

Which Plan is Better? WHERE EXISTS Instead of INNER JOIN

Did a switch to a WHERE EXISTS in temp table (Object13 in the plans) from an INNER JOIN to said temp table in final select in procedure. Logical reads plummeted, but plan cost and memory ...
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1 vote
1 answer
153 views

WHERE IN subquery too slow

I have a FULLTEXT search on the database, with the WHERE IN condition which checks that search results exists in another table. The query takes more than 1 hour to complete (companies table has 67k ...
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  • 11
-1 votes
1 answer
35 views

How to check existence of a value in between two columns of the same table

I have a table bills having columns id, starting_bl_no, ending_bl_no. How can I check a new bill number input is already exist in the table? id starting_bl_no ending_bl_no 1 100 ...
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1 vote
1 answer
37 views

Sql Exists clause

select * from product where productname in (select productname from product where ProductQty = 89) select * from product where exists (select ...
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1 vote
1 answer
79 views

Weird error on creating table and selecting rows from table

I have db and I am trying to create table called "sales_invoice_grid" I am having bellow scenarios: error 1: while creating the table "sales_invoice_grid" manually, it gives the message that it ...
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  • 111
0 votes
3 answers
58 views

What order does Oracle's EXIST condition compare the sub-query results?

I know EXIST works better than IN for larger sub-queries because it checks each sub-query record individually and stops once a comparison is found. Let's say I can order the sub-query in a way to ...
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1 vote
1 answer
60 views

Exist on table from linked Server giving Error 4104

I am comparing two tables on different Servers and the query I am running looks like this: Select top 100 * From [ServerA].[MyDB].[dbo].[Table1] Where Exists( Select * from [ServerB].[TheirDB].[...
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0 votes
1 answer
74 views

MySQL under what scenario suitable to use WHERE EXISTS

I recently just noticed that WHERE EXISTS can slow down the operation badly. E.g. select SQL_NO_CACHE count(*) as aggregate from `table_1` where exists (select * from `table_2` ...
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  • 101
1 vote
2 answers
91 views

Why my query does not return correct data (NORTHWIND)?

select * from orders o WHERE EXISTS ( select 1 from orders o2 where o2.EmployeeID = o.EmployeeID AND YEAR(o2.OrderDate) = 1997 and MONTH(o2.OrderDate) = 9 AND DAY(o2....
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  • 13
0 votes
1 answer
74 views

Select only those records that have same multiple values for a particular column if it's existing?

Below is an example of my pricing_supports table have more than 3 milions rows. There some rows having same values in the first_origin_id, delivery_id fields. If there're records with same ...
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0 votes
1 answer
189 views

Update + where not exist

once again, I come here for your rescue. how can I improve a query like this for a table with 20 million rows? I'm trying to update a table, by using the date and getting the first date of ...
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  • 1
0 votes
0 answers
54 views

Executing IF Exists condition

I have a sproc that scripts out permissions and in the process, I add a check to see if the object exists before dumping the results into a table. Then, I have another re-assign permissions sproc that ...
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  • 73
7 votes
3 answers
47k views

How to check if all elements of an array exists in a table?

Lets take an array of ids of size n in the application level. for instance [132,3425,13,13,... 392] where n is bigger than 100k entries. Some of this entries are repeated. I need to check if all of ...
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0 votes
1 answer
111 views

SELECT SUM and remove similar rows

SELECT SUM(coins.available_supply * hist_all.price) AS market_cap_usd_all FROM coins LEFT JOIN hist_all ON coins.id = hist_all.coins_id WHERE hist_all.price != 0 AND (hist_all.second_coin = '...
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  • 105
7 votes
1 answer
19k views

pg_restore ERROR: "Relation does not exist" and creating new database

I have made a backup of my specific tables that I want to restore into a new database using: call pg_dump -Fc -h server -d database -U user -p password -v -f dump.sql -t public.table1 -t public....
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  • 73
1 vote
4 answers
157 views

Select number of times 2 specific values show up for one record id

I'm not sure my title above makes sense, so I'll try to clarify. I'm using SQL Server. I have a table called Orders that looks like this (truncated): Order_Number | SKU 1 | abc ...
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2 votes
0 answers
109 views

"FOR UPDATE" in an "EXISTS SELECT" statement

Is there any potential problem in using (in a transaction) SELECT EXISTS( SELECT * FROM mytable WHERE id=36 FOR UPDATE ) i.e. having SELECT ... FOR UPDATE within an EXISTS? MySQL does certainly ...
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  • 395
11 votes
1 answer
3k views

Does the SQL Spec require a GROUP BY in EXISTS ()

Microsoft currently permits this syntax. SELECT * FROM ( VALUES (1) ) AS g(x) WHERE EXISTS ( SELECT * FROM ( VALUES (1),(1) ) AS t(x) WHERE g.x = t.x HAVING count(*) > 1 ); Notice ...
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0 votes
2 answers
3k views

Select Data from two tables ONLY IF ID on both tables are SAME

I need to select returns result SELECT wl.id FROM wishlist AS wl LEFT JOIN wishlist_products AS wp ON wl.id = wp.wishlist_id Only IF ALL of wp.product_id EXISTS in wishlist_products_bought....
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5 votes
1 answer
406 views

SQL Server OR operator causing massive loop join

The query below is very slow (running over a minute) and I have narrowed down the issue to the OR operator (...OR (EXISTS (SELECT...). I used live execution to verify that there is a nested loop join ...
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  • 105
0 votes
1 answer
283 views

How to determine if a timestamp in one table is between two timestamps in a subquery of another table?

I have two tables - one titled "index" which contains the 'datetime' timestamp with time zone, and one titled "planning" which contains the 'start_time' and 'end_time' timestamps. Here are the schema ...
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19 votes
3 answers
10k views

Wrapping query in IF EXISTS makes it very slow

I have the below query : select databasename from somedb.dbo.bigtable l where databasename ='someval' and source <>'kt' and not exists(select 1 from dbo.smalltable c where c.source=l.source) ...
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  • 2,879
0 votes
1 answer
2k views

Check if file exists in step in SQL

Need to create step in SQL job which check if file exist because if file exists it needed to be stop but if file not exist to continue with next step. xp_fileexist not allowed in sql query.
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0 votes
1 answer
32 views

Returning data based on if another column in another table is NULL

I'm trying to generate a list of data which is on completed status but has not been billed. I am able to produce a list of all completed orders however i am unable to remove the ones which have been ...
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  • 3
0 votes
2 answers
70 views

How to check if a record is linked with two or more values in a left join

In MySQL, I have a table of products connected with a different table with categories. I often show the list by making a LEFT JOIN and GROUPING the results: e.g. LEFT JOIN gives me: Name | Category ...
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  • 189
4 votes
2 answers
12k views

Howto combine UNION with EXISTS?

I have a query that looks like this: SELECT PubKey, Title FROM Publication UNION SELECT NoteKey, Title, FROM Note Which works fine. My trouble start when I try to add an EXIST to it: SELECT PubKey, ...
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39 votes
2 answers
5k views

IF EXISTS taking longer than embedded select statement

When I run the following code it takes 22.5 minutes and does 106million reads. However, if I run just the inner select statement by itself it only takes 15 seconds and does 264k reads. As a side note, ...
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  • 1,721
95 votes
4 answers
218k views

Best practice between using LEFT JOIN or NOT EXISTS

Is there a best practice between using a LEFT JOIN or a NOT EXISTS format? What is benefit to using one over the other? If none, which should be preferred? SELECT * FROM tableA A LEFT JOIN tableB B ...
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0 votes
1 answer
116 views

Select all from A where attribute exists in B [closed]

I have a question involving relational algebra. Suppose I have two relations A and B, where B has a foreign key that references A. Using relational algebra, how do I select all tuples from A where ...
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3 votes
1 answer
1k views

Full text search on two tsvector columns

I'm trying to do a full text search across two columns of two separate tables in PostgreSQL 9.4.2. The tables and columns are: article.article_title keyword.keyword Where there is a many-to-many ...
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3 votes
1 answer
98 views

How does 'exists' affect output

I previously asked a question about how to organize a long search query. I have taken it apart. I am presently attempting to understand the function of some of its parts. Specifically, I am ...
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1 vote
2 answers
2k views

MS Access: adding column if not exist (or try/catch it)

this is an easy question, but I can't find out the solution... I have to check if a column exists and add it if the test is negative. How can I do with only sql code? This is the syntax for SQL ...
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0 votes
1 answer
874 views

Helpme undestand MDX exists function

After spend almost decade in OLTP world I got the courage to try to build my first CUBE. I installed VS2012 and created Business Intelligence -> Analysis Services. I did build Data Source Views, Cube ...
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  • 2,323
1 vote
1 answer
1k views

Determine existence in recursive working table

I have a query that needs to check for existence of each input row type in another table, but it is unnecessary and inefficient to check for existence of subsequent rows of the same row type if one is ...
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  • 535
0 votes
1 answer
4k views

How can I create a bool column for a view based on the result of a statement?

I'm using PostgreSQL as my database. CREATE TABLE groups ( id SERIAL NOT NULL, name TEXT NOT NULL, PRIMARY KEY (id), UNIQUE (name) ); CREATE TABLE users ( id ...
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  • 377
0 votes
1 answer
13k views

Use if exists in postgresql [closed]

I know about the exists feature, but that does not help me with the given situation. What I want is: Check if some row exists, and if exists then check for an another row if row exists. Here's ...
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1 vote
1 answer
536 views

Performance of checking for data in related tables

NB: this question is purely academic / to help improve my understanding of SQL Server performance. Given a master table which relates to one or more other tables, how would you determine the best ...
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