Get 0 value from a count with no rows
You need to use the COALESCE function in PostgreSQL http://developer.postgresql.org/pgdocs/postgres/functions-conditional.html Essentially you need to tell SQL how to handle NULLs. i.e. When NULL return 0.
select
MySQL – SQL_BIG_SELECTS
MySQL determines whether or not a query is a ‘big select’ based on the value of ‘max_join_size’. If the query is likely to have to examine more than this number of rows, it will consider it a ‘big select’. Use ‘show variables’ to view the value of the max join size. I believe that indexing … Read more
postgres update after select
Why not use the RETURNING clause and process both things in one single statement: UPDATE jobs SET status=”RUNNING” WHERE status=”PENDING” RETURNING * That way you will get all rows that were changed by the UPDATE with a single atomic operation.
jQuery find input type (but also for select)
You can do this (fiddle here), make some sort of easy to use plugin: $.fn.getType = function(){ return this[0].tagName == “INPUT” ? this[0].type.toLowerCase() : this[0].tagName.toLowerCase(); } And use it like this $(“.element”).getType(); // Will return radio, text, checkbox, select, textarea, etc (also DIV, SPAN, all element types) $(“.elList”).getType(); // Gets the first element’s type Which … Read more
React JS : React Select Dropdown position to top if there is no space below
You can use menuPlacement option on your Select component with “bottom” (default), “top” or “auto”. You can see other props here 😉
Shouldn’t FROM come before SELECT in Sql? [closed]
Yes it is strange and counterintuitive. Hugh Darwen theorises about how this state of affairs came about: Do you take SELECT-FROM-WHERE for granted, or do you, like me, find it rather curious that the System R team should have spurned the normal way of writing expressions of arbitrary complexity in favour of something utterly idiosyncratic … Read more
How to rename columns with `SELECT`?
SELECT table1.price, table2.price AS other_price …
jq: how to filter an array of objects based on values in an inner array?
Very close! In your select expression, you have to use a pipe (|) before contains. This filter produces the expected output. . – map(select(.Names[] | contains (“data”))) | .[] .Id The jq Cookbook has an example of the syntax. Filter objects based on the contents of a key E.g., I only want objects whose genre … Read more
python – How select.select() works?
Python’s select() gets passed through as a select() system call as you are expecting, but the problem you have with it blocking is a different issue, probably relating to buffering. Just to satify yourself that select() is doing the right thing, try reading/writing a file on the file system rather than using a special device … Read more
ERROR: CASE types character varying and numeric cannot be matched
All the branches of a case expression should return the same datatype. One way to achieve that is to explicitly cast where needed: ,(case when all_loc.country = ‘DE’ then msc_si.buyer_id::varchar else msc_si.buyer_name end) as “purchasing_group_name_buyer_name” — Here ———————————————–^ ,(case when all_loc.country = ‘DE’ then msc_si.planner_code::varchar else mscp.description end) as “mrp_controller_name” — And here ———————————————–^