I have a postgresql table contains a list of email addresses. The table has three columns, Email, EmailServer (e.g., gmail.com, outlook.com, msn.com, and yahoo.com.ca etc.), and Valid (boolean). Now, I want to group those emails by EmailServer and then update the first 3 records of each large group (count >…
Tag: limit
SQL CASE WHEN: is there a limit ( in number of characters )? [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 9 months ago. Improve this question I’m using the case when statement to group locations ( starting & destination lat…
Limit the results returned by MySQL join to 1
I’m doing a JOIN on two tables and the right side has multiple results for the ON clause: e.ID = ti.event_id. How do I limit the results returned by the join to 1? Sort of like LIMIT 1 events_detail …
MySQL – #1064 – Something is wrong in your syntax ‘LIMIT 0, 25’
Server: MariaDB, version 10.4.17 Query: Error in phpMyAdmin: Error in MySQL Workbench: All right so MariaDB decided to modify my query throw error that shouldn’t be thrown Let’s find out what is wrong with select something from (select 1, 2 as something) limit 123: I restarted the server and this …
Using arithmetic operators and/or brackets in a LIMIT clause
I have the following small subquery in query in stored procedure. But there is the syntax error: “(” is not valid at this position, expecting an identifier So, the question is: do I have a possibility to use brackets and/or arithmetic operators in LIMIT clause? Documentation says I can use local v…
Right syntax to use near ORDER BY when I try to delete some number of rows
When I try to delete some rows from tables (rows got from joined tables) (Ex : if I get 10 records, then need to delete first 2 records) using ORDER BY ASC and LIMIT = 2. But getting error You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right
SQL ON SINGLE TABLE GROUP BY LIMIT 10
I have a table with items (id_item, name, category, stock,…) I’d like make a query to group by result on category and LIMIT 10 first items which are in this category Is it possible? Answer You can use row_number(): The ? is for the column that specifies what YOU mean by “first”.
Sql limit record grouped
I have a table ‘Players’ In this table the columns are ‘ID’,’surname’,’nation’ I need a query and result must shows a list of Players by nations limited by 4 for nations Ex Table players Resultset Answer With row_number() window function: See the demo. Or if you…
SQL order with equal group size
I have a table with columns month, name and transaction_id. I would like to count the number of transactions per month and name. However, for each month I want to have the top N names with the highest …
Why query is still so fast when I operate a non-indexing column?
I am learning indexing of database. here are indexings of a table. And this table has 330k records. mysql> show index from employee; +———-+————+————-+————–+———…