So if threadId is more unique of a field, you could try this index definition as well CREATE INDEX IX_YourIndexName ON message (threadId, currentUserId, timestamp). By defining your indexes with the most unique fields first, it improves the selectivity of that index because less values need to be seeked on upfront. Note you might even see a slight performance benefit by switching around the order of currentUserId and threadId in the index definition, assuming the threadId is more unique than the currentUserId in the table. For more information on indexing in SQLite.
And then also adding the fields from your ORDER BY clause will help sort the index on those fields as well which will reduce the work for sorting when your query runs. Using ORDER BY, data can be sorted eighther in ascending order or. The reasoning being you should index on all fields in your predicates ( JOIN, WHERE, and HAVING clauses) to create a fully covering index (see 1.7 Covering Indices) which would be the currentUserId and threadId in this case. In SQLite the ORDER BY clause can be used to sort the result based on more than one columns. By defining your indexes with the most unique fields first, it improves the selectivity of. class is in ascending and mark is in descending order. For more information on indexing in SQLite. q'SELECT FROM student ORDER BY class DESC,mark DESC'. Both class and mark columns are in descending order. By default the order is always ASC ( Ascending ). Ticket tracker Report bugs with Django or Django documentation in our ticket tracker.As ypercube mentioned, you'll want to create your index on all three fields, currentUserId, threadId and timestamp like so: CREATE INDEX IX_YourIndexName ON message (currentUserId, threadId, timestamp). We can use ASC for ascending order and DESC for descending order against each columns. SQLite uses values userid, us In MySQL: SELECT FROM table LIMIT 0.
SQLITE ORDER BY CODE
SELECT city, country FROM customers ORDER BY country Code language: SQL (Structured Query Language) (sql) Try It The result set contains duplicate city and country e.g., Sao Paulo in Brazil as shown in the screenshot above. quote near the SELECT DISTINCT ON with ORDER BY ID ) Output: Conclusion. Official Django Forum Join the community on the Django Forum. SQLite SELECT DISTINCT on multiple columns The following statement finds cities and countries of all customers. ORDER BY entrancetime ASC LIMIT 1' sqlite.prepare(sql) if sqlite.step then. Django Discord Server Join the Django Discord Community. If the stock is below the reorder point and no order is on the way. #django IRC channel Ask a question in the #django IRC channel, or search the IRC logs to see if it’s been asked before. django-users mailing list Search for information in the archives of the django-users mailing list, or post a question. By default, ORDER BY keyword sorts the result in ascending. Index, Module Index, or Table of Contents Handy when looking for specific information. The SQLite ORDER BY keyword is used to sort the result table in ascending or descending order. If an order is specified by the ORDER BY clause, the rows are then sorted by the specified data in either ascending or descending order. Getting help FAQ Try the FAQ - it's got answers to many common questions. FROM & JOIN -determine table & filter rows WHERE -more filters on the rows GROUP BY -Combine rows in group HAVING - filters on group ORDER BY - arrange the remaining rows. In SQLite, the order by clause first sorts according to a values data type and only then according to the.
SQLITE ORDER BY SOFTWARE
Farrell donated to the Django Software Foundation to Relevance of the data type in an order by clause.