Sqlite order by code#

We will use the customers table in the sample database for demonstration. In SQLite, by using Order By clause we can sort SQLite select statement result set either in ascending or descending order based on our requirement. In database theory, if a column contains NULL values, it means that we do not have the information about that column of particular records or the information is not applicable.įor example, if a customer has a phone number with a NULL value, it means we don’t have information about the phone number of the customer at the time of recording customer information or the customer may not have a phone number at all. If you use the DISTINCT clause with a column that has NULL values, SQLite will keep one row of a NULL value. SQLite considers NULL values as duplicates. This tutorial takes you starting from basic to advance SQLite concepts. In case you use multiple columns, SQLite uses the combination of values in these columns to evaluate the duplicate. SQLite - ORDER BY Clause - SQLite Tutorials for Beginners - Learn SQLite basic to advanced concepts with examples including database clauses command functions administration queries and usage along with Android, C, C++, Python and JAVA in simple steps. If you use one column, SQLite uses values in that column to evaluate the duplicate.

Second, you place a column or a list of columns after the DISTINCT keyword.

First, the DISTINCT clause must appear immediately after the SELECT keyword.

Sqlite order by code#

We can verify this result with a query using the ORDER BY clause.FROM table Code language: SQL (Structured Query Language) ( sql ) So it doesn’t return the string with the maximum amount of characters or anything like that. SELECTĪs mentioned, max() returns the value that would be returned last using the ORDER BY clause (assuming it’s using the default ascending order). all values are NULL), then max() returns NULL. SELECTĪs mentioned, if there are no non-NULL values in the group (i.e. To achieve the desired order, you can use the following: SELECT FROM todos WHERE todos.id in ( 1, 3, 2, 4 ) ORDER BY CASE todos. We can verify this by running another query with an ORDER BY clause. There's a neat way of ordering things that is very specific but lends itself to be programmatically generated. SELECT max(AlbumCount)įROM (SELECT ArtistId, count(Title) AS AlbumCount Here’s an example that combines the max() function with the count() function to return the maximum count. You can change the order of the rows by adding an ORDER BY clause at the end of your query, with a column name after. ORDER BY Price ASC Combine Max() with Count() Just to be clear, I could have used the following for the same result: SELECT * FROM Products This means that if there is a RETURNING clause, the rows returned by the statement probably will not be in the order specified by the ORDER BY clause. The order in which rows are deleted is arbitrary and is not influenced by the ORDER BY clause. As mentioned, the max() function returns the value that appears last when using this clause (assuming you order the column in ascending order, which is the default). The ORDER BY clause on a DELETE statement is used only to determine which rows fall within the LIMIT.

I used the ORDER BY clause in this example. If all rows were NULL, then max() would return NULL. The max() function ignores that, because the other rows have non-NULL values. Notice that the first row has a NULL value for the price. Here’s a query that returns all rows in that table. Think of a database as a spreadsheet with rows, columns, and cells, where cells can contain data.

To sort the result in descending order, DESC keyword is used. By default, ORDER BY keyword sorts the result in ascending order, however it can be specified using ASC keyword. The maximum value is the value that would appear last in a query that uses an ORDER BY clause on the same column. Columns are identified by names that are unique per table. The SQLite ORDER BY keyword is used to sort the result table in ascending or descending order. The SQLite max() function returns the maximum value from all values in a group.