Questions tagged [where]
The `WHERE` clause is used to specify criterion for retrieval or modification of rows from objects in a database.
161
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How to query in the given order
select * from table where options=(10,223,43,1,23,54,323,32)
But the result is not coming in the given order of options. Options need to be changed frequently.
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2
answers
40
views
Selecting last value to be entered each month
I am looking to pull a closing balance from the database for each month.
I have tried
SELECT CloseBal As 'Balance', MONTHNAME(DateTime) as 'Month', DateTime
FROM Table1
WHERE MAX(DateTime)
Group By ...
- 43
0
votes
1
answer
333
views
How do I query only rows where multiple instances with the same ID exist with Postgres?
I have a table where I want to gather some statistics, but only for items that are repeated two or more times. To simply, here is how the table looks like:
CREATE TABLE test (
id bigint,
...
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1
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179
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Which database scheme will be better for dating app performance?
I'm creating dating app like Tinder with Spring Boot and want to make sure that even with huge amount of data it will be working with best possible performance.
My tables looks like above. All tables ...
-3
votes
1
answer
55
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Poor query performance depending on the placement of `where` conditions (MySQL)
There is a query, in which changing the ordering of where conditions affects its performance drastically (5k vs 700k rows_examined).
The weird thing is that both versions of the query have the exact ...
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4
votes
1
answer
181
views
Concurrent update on two different tables fail
I'm using PostgreSQL with the following database schema:
CREATE TABLE plans (
slug VARCHAR(500) PRIMARY KEY
);
CREATE TABLE users (
id VARCHAR(16) PRIMARY KEY,
org_id VARCHAR(16) NOT NULL
...
0
votes
1
answer
59
views
mySQL INNER JOIN and Conditions
I wrote a mySQL query that is just works as I need.
SELECT COUNT(wp_posts.ID) as count, wp_terms.term_id
FROM wp_terms
INNER JOIN wp_term_taxonomy ON wp_term_taxonomy.term_id = wp_terms.term_id AND ...
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votes
2
answers
583
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SQL Return Table with where clause and occurrences of value of total table
I am stumped trying to figure out how to achieve this. I know how I would achieve it in C#, but not SQL.
Say I have the following table:
ID
Name
RouteId
1
Bob
1001
2
Bob
1002
3
Ana
1001
4
Jim
...
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0
votes
1
answer
34
views
Can I make a parameterized equality based condition in the where clause of a SQL statement always true
I have a series of queries which depend on a where clause which looks like the following:
where a = <a>
and b = <b>
and c = <c>
and d = <d>
The angular brackets ...
- 101
0
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1
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265
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Why my simple searching query is too slow?
I don't know why searching in my "cities" table is so slow.
My query looking for a table "cities" located about 25km from the city.
I use this simple query and the database takes ...
- 83
0
votes
2
answers
229
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Filter by field, and if zero results then filter by other field
How should a WHERE clause be constructed, such that:
It filters by a certain field
If there are zero results for filtering by the aforementioned field, then it filters by another field?
For example, ...
- 425
0
votes
1
answer
59
views
Sum of Total per Client
I want to know the total of each product that each customer has bought and I don't know how to add the total per customer.
The tables are as follows:
CREATE TABLE CLIENTES -- Customers
(
CODIGO ...
2
votes
2
answers
1k
views
Why does a MySQL 'where' clause with Index make a SUM query slower?
I have a table with 5 million records. Table columns are id, customer_id, status, and amount. When I run a query without Index(status),
SELECT SUM(amount) FROM `game_results` WHERE `status` = 1
the ...
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1
answer
34
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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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1
vote
2
answers
404
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SQL having clause
I was studying about the having clause when I came across this website.
The last two lines of this article have made me puzzled.
Similar to the WHERE clause, the HAVING clause requires that the ...
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1
answer
125
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Having trouble with where subquery count
Assume all of the table and field names are correct. I've tried this a few different ways but this is the only that makes sense needing the join in both. This is the question:
SQL query to get the ...
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2
answers
96
views
What are the more important columns to include in NONCLUSTERED INDEX - from Group by or Where?
I am thinking about adding a NONCLUSTERED INDEX to a table in SQL Server 2016. I found that most queries refers to WHERE clause like:
WHERE varcharColumn <> ''
and varcharColumn2 = '2'
and ...
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-4
votes
1
answer
57
views
How to join two tables in sql server? [closed]
I need some help i have a query, struggling to use join and database is sql server. Below is my table definition.
// sql server query
SELECT TOP 1000 [Station Code]
,[Transaction Code]
...
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0
votes
1
answer
280
views
Given a table with date_time column, how to run a query using only the date
I have a DB with a table which has a column datetime Date_Time.
The format of this is for example: 2021-09-01 13:15:16.
I would like to set a query that is indipendent of the time but just consider ...
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2
answers
839
views
Is it possible to nest CASE-statement into WHERE clause?
I am developing an application with FastAPI. It contains a function that brings two variables into a SQL query using the sqlalchemy.sql.text as shown here.
SELECT ATTR3
FROM TABLE
WHERE ATTR1 = ...
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0
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1
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282
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Adding new user info to current old user accounts
Hey all so I have a database that has been up and running for a few months now. I had a request to add the users First and Last name as well as their organization.
This was easy enough to do for NEW ...
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51
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How does MySQL handle indexes and where clauses with joins
I am querying large tables with joins and where conditions.
An example query:
SELECT *
FROM forename
JOIN forenameLength ON forenameLength.nameRef = forename.nameRef
WHERE forename.placeRef = 18000 ...
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2
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58
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Complex `where` dramatically affects query performance
There are much more complex queries running on these tables that are much faster but this one takes 90+ seconds to run.
What am I doing wrong here? How can this be improved?
SELECT
r.id ...
1
vote
0
answers
139
views
PostgreSQL - Dynamic filter expression
Given a simple function (SQL for the sake of example, can be plpgsql)
CREATE OR REPLACE FUNCTION dynamic_filter(
f INT[] DEFAULT NULL
) RETURN INT[] LANGUAGE SQL AS
$$
SELECT ARRAY_AGG(val)
...
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1
vote
2
answers
49
views
Under what circumstances would these 3 queries return different number of results?
Hello I have the following question:
Query 1:
SELECT b.id,
(
SELECT SUM(cb.invoice_amount) AS sum
FROM payment_lines cb
WHERE cb.batch_id = b.id
) AS batch_total_invoice_amount
...
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0
votes
1
answer
110
views
Subquery with variable in where
I don't know why but if I do the subquery where in the first LEFT JOIN with the value of the variable @id it does not return any results, it is as if the value of @id was always null.
But why not do ...
0
votes
2
answers
40
views
Update field with the longest varchar field
I need to update on of the varchar fields in a table, but only the record that is the longest varchar (has the most data in it.). I could easily find it with this query:
SELECT TOP(1) options
FROM ...
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2
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Unknown column in 'where clause' when using an alias for a subquery in MySQL
This simple query:
select exam.id as exam_id,
(select count(*) from dataset where dataset.id = exam.id) as n_dataset
from exam
where n_dataset = 0
returns the following error:
ERROR 1054 (42S22) at ...
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1
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626
views
Is there any better way to list all the databases in Postgres except database named postgres?
SELECT datname FROM pg_database WHERE datistemplate = false AND datallowconn = true And datname NOT IN ('postgres')
Using the code above, I get all the databases except postgres as shown in the image ...
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1
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291
views
Materialized view logs — with condition?
I've created materialized view logs on a WORKORDER table in an Oracle 19c database.
create materialized view log on my_workorder_system.workorder with rowid;
The plan is to integrate the WORKORDER ...
- 1,427
2
votes
1
answer
94
views
Check the result of a math expression in mysql
Let's say I have a table, which has four columns (a, b, oper and c) and some primary key column. oper means arithmetic operation (+ - * /) here.
a b oper c
-------------
2 3 + 5
4 2 / 3
...
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2
votes
2
answers
60
views
Where Clause for Results Appearing after Occurence
I'm wondering if it's possible to find records that only appear after the first occurrence of a where clause. I'm currently using PostgreSQL for this example but something not PostgreSQL specific ...
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2
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31
views
(Beginner) MYSQL: What can I do about this where statement?
Suppose I have some table named tableA and column1 in tableA has some null values and strings.
Also suppose I had created some temporary table named tempTable that has only 1 column. And that 1 column ...
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1
answer
2k
views
Need to filter by month
I am using SQL Server Management Studio.
I am trying to filter by month using dtm DATETIME as my format XX/XX/XXXX. I am very new to SQL, so I was trying to just filter by the month of January 01 with ...
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3
votes
1
answer
1k
views
Does using inequality (<>) or NOT in where clause lead to SQL ignoring the index?
I found this article that talks about avoiding using <> operator in where clause because optimizer ignores the index.
https://www.mssqltips.com/sqlservertutorial/3203/avoid-using-not-equal-in-...
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1
vote
1
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572
views
Function that loops through array parameter values to build multiple WHERE clauses (postgres 11.4)
I have been iterating on an idea presented by Rob Conery in his excellent post to generate monthly reports using PostgreSQL Views.
My version required the View to be refactored into a Function as I ...
1
vote
1
answer
56
views
CASE in WHERE clause - retuns a single-row result instead of 4 rows?
Everyone,
I do not want to bother you with the whole tables schema so I will paste a couple of screenshot only so that my question becomes clear - I need to show all projects that are related to ...
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0
votes
1
answer
36
views
Inconsistent ResultSet from Procedure with Variables
I'm working on building a procedure with two inputs, and the Syntax checks out, but the result-set is not consistent with the logic.
In this question, there are in actual fact two questions. Number 1 ...
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1
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725
views
How does adding LIMIT work with Where conditions in mysql?
In my database, there is only one record which satisfies the condition iv_title = 'ball skills'.
Now I'm executing the following query :
SELECT
*
FROM
`imageAndVideo`
WHERE
`iv_title` = '...
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2
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306
views
More than 64 parameters to WHERE IN sentence makes MSSQL reading far too many rows
I have some queries where I need to get more than 64 specific rows, like this example with 65 IDs.
TableID is primary key, type BigInt.
SELECT * FROM TableA
WHERE TableID IN (260905384, ...
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2
votes
1
answer
4k
views
How to check other table for value during insert
In PostgreSQL is it possible to check another table's data to see if there is data that fits a certain condition during an INSERT statement?
I have attempted to use WHERE NOT EXISTS as I want to not ...
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votes
1
answer
57
views
How to use WHERE condition when using ON clause [closed]
I have looked at similar posts and have tried them but dint seem to work. In the below query on a MSSQL 2015 database, I need to filter out inactive users. That is, only return results where 'Active' =...
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1
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27
views
Performance of query from this schema
Essentially all comments are stored in this schema (dbml)
table comments {
commentID BINARY(16) [not null] //UUID
post_date timestamp
postID BINARY(16) [not null] //UUID
has_reply bool [...
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0
votes
0
answers
90
views
Speed up query on large MySQL table
SELECT property, geo, stars
FROM table
WHERE SUBSTRING_INDEX(geo, '>', 3) LIKE '%$mylocation%'
...loop to show results
geo column has values like - Spain>Canary Islands>Lanzarote>Some ...
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votes
2
answers
39
views
UPDATE with too much values at IN state takes too long
I have the next query:
UPDATE plates_owners SET deleted=1 WHERE plate_id=4748 AND branch_id IN
(23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,42,43,46,47,48,64,79,82,83,102,103,130,169,209,...
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votes
2
answers
5k
views
Perform TABLESAMPLE with WHERE clause in PostgreSQL
I want to use TABLESAMPLE to randomly sample from rows that meet a certain condition with PostgreSQL.
This runs fine:
select * from customers tablesample bernoulli (1);
But I cannot figure out how ...
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0
votes
2
answers
370
views
How to select Overdue Rows with Date Frequencies?
+------------------------+--------+
| Invoice_id | due_date | amount |
+-------------+----------+--------+
| 20 |2020-01-18| 1250 |
+-------------+----------+--------+
| 21 |2020-...
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views
Can't manage to work with comparing days
In a table with persons and their birthdays, the ones whose birthday is in less than 7 days need to be displayed.
I found some answers on the Internet but they all are at least 5 years ago with ...
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votes
2
answers
2k
views
Select Rows From One Table, Where Matching Rows in Another Table Has Empty Column
I have multiple Postgres tables that look like the following. They are generated on a daily basis, so each just represents the data that was processed for that day:
data_20200113
+-----------+-------...
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1
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891
views
bridge table joined table have both the keys equal to both the keys
SELECT DISTINCT i0.id,
i0.name
FROM main_table AS i0
RIGHT OUTER JOIN "bridge_table" AS i3 ON i3."main_table_id" = i0."id"
RIGHT OUTER JOIN "other_table" AS r4 ON i3."other_table_id" ...
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