Im using this: But my query is empty. I have also tried this (This one works): But obviusly my query only contains the max_id key. What am I doing wrong with the first one? Answer You need to add another level of select for the MAX, like this: A better approach would be to order by id in descending order,
Tag: sqlite
Compare row count of two tables in a single query and return boolean
I want to compare row count of two tables and then return 0 or 1 depending on whether its same or not. I am thinking of something like this but can’t move ahead and need some help. I am getting multiple rows instead of a single row with 0 or 1 Answer you have to remove : Otherwise it will
sqlite count of distinct occurrences
What is the best way of writing a sqlite query that will count the occurrences of colC after selecting distinct colA’s ? SELECT colA, colB, colC FROM myTable WHERE colA IN (‘121’, ‘122’,’123′,’124′,’…
Select a specific index row in sqlite
I have an index and I need to find out what is the row in a table with that index, in SQLite. Example: Index = 1 Table: Which is the correct SELECT that I can use to solve my problem? Answer Typically to get a specific row you can always request them by rowid, e.g. However, there are some atypical
How to use CTE’s with update/delete on SQLite?
SQLite now has CTEs, and the documentation says you can use it with insert, update and delete queries — but only gives examples of select statements. I can figure out how CTEs apply to inserts, via insert-select; but how can we use them in update or delete, where there is no from-clause? Answer CTEs can be used in subqueries:
Searching for a specific text value in a column in SQLite3
Suppose I have a table named ‘Customer’ with many columns and I want to display all customers who’s name ends with ‘Thomas'(Lastname = ‘Thomas’). The following query shows an empty result(no rows). Also it didn’t show any error. While executing the following query give me correct result. I would like to know what is the problem with my first query.
INSERT INTO with use CASE – sqlite?
I have a problem with syntax. I need use IF in sqlite, and I replace IF – CASE. My statement doesn’t work, I don’t know, what is wrong? Answer Assuming the default for aNew is NULL: Otherwise you’ll need to put that logic in your application code.
Storing a huge amount of points(x,y,z) in a relational database
I need to store a very simple data structure on disk – the Point. It’s fields are just: Moment – 64-bit integer, representing a time with high precision. EventType – 32-bit integer, reference to another object. Value – 64-bit floating point number. Requirements: The pair of (Moment + EventType) is unique identifier of the Point, so I suspect it to
Retrieve Sqlite table data in C++
I have the code as below. I am trying to simply get data from a table i have already created. How do i get the data in the array p_fields that is defined in the callback function into a variable in …
GROUP_CONCAT in SQLite
I am having data like this by using this query Now, I want to show data like this and so on..I also know it can achieve by GROUP_CONCAT function. So, I tried with this But, It shows me error. So, what I am doing wrong here. What are the right procedure to achieve that? Answer You need to add GROUP