9/12/2023 0 Comments Sqlite order by frequencyThe items are organised in a tree with a parent_id and a closure table. ORDER By ifnull(nullif(i4.date, ""), date()), subtimeįROM item AS i1 JOIN closure AS c1 ON ( i1._id = c1.ancestor_id ) Ifnull(nullif((SELECT ifnull(nullif(i4.time, ""), "00:00:00") AS subtimeįROM item AS i4 JOIN closure AS c4 ON (i4._id = c4.item_id) SQLite ORDER BY clause is used to sort the data in an ascending or descending order, based on one or more columns. ORDER By subdate, ifnull(nullif(i3.time, ""), "00:00:00") In SQLite ORDER BY clause is used to sort column records either in ascending or descending order. Secondly: The way to get your ROWs back in a specific order, is to use an ORDER BY statement. Ifnull(nullif((SELECT ifnull(nullif(i3.date, ""), date()) AS subdateįROM item AS i3 JOIN closure AS c3 ON (i3._id = c3.item_id) Firstly: You get a bag-o'-stuff if you ask for, the order of neither the ROWs, nor the COLUMNs are guaranteed or implicit in any way, and the SQL engine du jour is free to return as they wish, and often will do it. Why use LIMIT when, well, we could just have all the data Remember that more data is not always better. if there is no date nor time, both are set to an empty string SELECT FROM babynames LIMIT 1 Result: Pretty easy, there's not much more to LIMIT than the keyword itself, followed by the number of rows we want to see. if there is a time but not date, date is set to today if there is a date but no time, time is set to 00:00:00 get the closest deadlines among the children : (count( c1.item_id ) - 1) AS children_count,įROM item AS i2 JOIN closure AS c2 ON (i2._id = c2.item_id)ĪND c2.item_id NOT IN (0, i1._id)) AS unchecked_children_count, count the children (-1 is because the closure table include a relation between any item and itself) SELECT i1._id AS _id, i1.title AS title, i1.checked AS checked, Here is the whole query if you ever think you need all the data to find a proper solution. I'd like to order the result of the query the following way : |_checked = 0įor now, I got something simple like "ORDER BY i1.checked, date, time" but the trouble is with this the items with empty date and times stay on the top. I have a loooooooooooong SELECT ending with a ORDER BY that can include the following values :
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