Ok, this is my query: When it pulls the data, I get the correct row for the video_id, but it pulls the first row for each category for the others. So when I get the max result for the video_id of category 1, I get the max ID, but the first row in the table for the url, date, title,
Tag: sql
Postgres: Add constraint if it doesn’t already exist
Does Postgres have any way to say ALTER TABLE foo ADD CONSTRAINT bar … which will just ignore the command if the constraint already exists, so that it doesn’t raise an error? Answer This might help, although it may be a bit of a dirty hack: Then call with: Updated: As per Webmut’s answer bel…
Query to get all those names of employees,who have ‘A’ as their middle character in their name
E.g:- BRAKE,CRANE etc. In my employees table , I have ENAME,ENO,JOB,SALARY. Here, I want to extract out those enames that have an ‘A’ as the center character in their name. If length of ename is …
Get DateTime with time as 23:59:59
I’m trying to do a where statement that specifies a DateTime field is between the start and end of the previous month. To do this, I need to specify that the first day of the previous month has a time of 00:00:00 and the last day of the previous month has a time of 23:59:59. This second condition is giv…
Update Query with select and row lock
I got this query as part of a previous answer to my question. Now how to lock the rows in the select query to make sure no other thread over writes my update. Answer It’s not clear to me that you have the problem you seem to think you have. Updating a row in the table inherently places a row-level
SQL to Query text in access with an apostrophe in it
Please help me with this because I cannot seem to get it right I am trying to query a name(Daniel O’Neal) in column names tblStudents in an access database however access reports a syntax error with …
How to query database by id using SqlAlchemy?
I need to query a SQLAlchemy database by its id something similar to but for id. How do I do this? [Searching over Google and SO didn’t help] Answer Query has a get function that supports querying by the primary key of the table, which I assume that id is. For example, to query for an object with ID of
How to select date and time without the seconds in mysql?
How do I select date and time without the seconds in mysql from a column with date value in a table ? “YYYY-MM-DD HH:MM:SS” should be “YYYY-MM-DD HH:MM” Answer
Numbers of weekdays in a date range in TSQL
This is harder than it looks. I need a function that calculates the numbers of a given weekday in a date range. I don’t want any loops or recursive SQL. There are millions of examples doing just that. I need a fast function for calculation. Input of the function will be weekday, fromdata, todate Expecte…
How to write query for this?
Hi friends I have a table like this ID bid sub_bid cid sub_cid 1 0 2 1 0 2 5 0 3 0 3 3 0 0 4 4 2 0 4 0 on that table either (bid or sub_bid) OR (cid or sub_cid) will be null. I have to write a query for fetching like this.. if bid is