SQL COUNT overflow
Use COUNT_BIG SELECT COUNT_BIG(*) FROM Similarities WHERE T1Similarity = 0 OR T2Similarity = 0
count
How can I count how many duplicates there are for each distinct value in sqlite?
My quick google with the terms “count unique values sqlite3” landed me on this post. However, I was trying to count the overall number of unique values, instead of how many duplicates there are for each category. From Chris’s result table above, I just want to know how many unique colors there are. The correct … Read more
PHP – count specific array values
$array = array(“Kyle”,”Ben”,”Sue”,”Phil”,”Ben”,”Mary”,”Sue”,”Ben”); $counts = array_count_values($array); echo $counts[‘Ben’];
Count the number of times a string appears within a string [duplicate]
Regex.Matches(input, “true”).Count
Most efficient way to get table row count
Following is the most performant way to find the next AUTO_INCREMENT value for a table. This is quick even on databases housing millions of tables, because it does not require querying the potentially large information_schema database. mysql> SHOW TABLE STATUS LIKE ‘table_name’; // Look for the Auto_increment column However, if you must retrieve this value … Read more
MongoDB ‘count()’ is very slow. How do we refine/work around with it?
There is now another optimization than create proper index. db.users.ensureIndex({name:1}); db.users.find({name:”Andrei”}).count(); If you need some counters i suggest to precalculate them whenever it possible. By using atomic $inc operation and not use count({}) at all. But mongodb guys working hard on mongodb, so, count({}) improvements they are planning in mongodb 2.1 according to jira bug.
SQL COUNT* GROUP BY bigger than,
HAVING clause for aggregates SELECT ItemMetaData.KEY, ItemMetaData.VALUE, count(*) FROM ItemMetaData Group By ItemMetaData.KEY, ItemMetaData.VALUE HAVING count(*) > 2500 ORDER BY count(*) desc;
Item frequency count in Python
The Counter class in the collections module is purpose built to solve this type of problem: from collections import Counter words = “apple banana apple strawberry banana lemon” Counter(words.split()) # Counter({‘apple’: 2, ‘banana’: 2, ‘strawberry’: 1, ‘lemon’: 1})
Counting number of grouped rows in mysql
Try this simple query without a sub-query: SELECT COUNT(DISTINCT component) AS TotalRows FROM xyz WHERE labref=”NDQA201303001″; See this SQLFiddle
How do you access the value of an SQL count () query in a Java program
Use aliases: SELECT COUNT(*) AS total FROM .. and then rs3.getInt(“total”)