Optimal query pattern to count related entries in PostgreSQL
110887
Trying to get count of childs rows
60555
How to count occurrences of a column value efficiently in SQL?
126717
How to approach GROUP BY in PostgreSQL using Rails?
154663
Making a recursive CTE like query, but for many records
29232
Find total number of relations that are equivalence as well as partial order set
1458
Pattern matching with LIKE, SIMILAR TO or regular expressions in PostgreSQL
156237
Efficient query to get greatest value per group from big table
21141
Finding if which users have a record type available to them using SOQL
90353
Best way to select random rows PostgreSQL
124690
MySQL: Tree-Hierarchical query
152775
Alternative to Intersect in MySQL
144686
Database design: Best table structure for capturing the User/Friend relationship?
96534
Efficiently select beginning and end of multiple contiguous ranges in Postgresql query
139195
MySQL silly query plan
55545
Find the Foreign Keys Associated with a Given Primary Key
8176
Relational Database Design Patterns?
157000
Is there a nesting limit for correlated subqueries in some versions of Oracle?