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Rating Stats for

Stefanos Zilellis

Rating
1448.63 (4,533,011th)

Reputation
302 (410,000th)

Page: 1 2

Title	Δ
Query optimization needed	-3.01
SQL Server: query optimization	-1.79
Very slow when order by id, but fast when order by timestamp, id	+0.34
Optimization of Person table with FirstName, SecondName and LastName	+0.55
Index when using OR in query	-2.18
SQL Question: Does the order of the WHERE/INNER JOIN clause when in...	-0.95
How many times does the same ROUND and/or SUM execute if used in th...	-2.77
Efficiently selecting distinct (a, b) from big table	-2.12
Performance difference between Insert and Insert Where Not Exists	+0.43
What's the fastest way to check if a username is available with...	-0.95
Verify SQL Server statistics	+0.42
Query optimization from from query execution plan	-3.63
Design pattern for optimizing query performance of dynamic sorts in...	+5.36
SQL View From a View Running Slow	+0.41
How can I combine the three queries to one and possibly improve per...	+1.19
SQL nested loops are too costly	-2.04
Oracle mutliple left outer joins only max() rows	-3.35
Are these two conditions equivalent (in a sql)?	-0.71
Explicit JOINs vs Implicit joins?	-0.92
SQL: is there ever any reason to use a subquery instead of a CTE?	-2.66
SQL Server - Inserting new data worsens query performance	+4.70
Optimising a complex view that uses several CTE's	-3.92
Benefits of INNER JOIN over CROSS APPLY	-2.30
Oracle SQL performance optimization	-1.70
How can a covering index satisfy more than one query?	-3.69
How can write this query in sql?	-3.74
Database design for book reader app	-1.63
Is it faster or less memory intensive to limit data to one table in...	-3.21
Django: Random query slow - despite optimizations	0.00
SQL Query optimization : is scalar subqueries killing the performan...	+0.28
BigQuery - Group By with multiple fields extremely slow	+5.40
SQL Sever Query Join Optimization	-3.02
How to calculate maximum perfomance of mysql when importing big sql...	-0.26
Bigdata Project Scalable Architecture	0.00
MySQL query with JOINs in large Database	-0.97
Perform SQL query parallel procesing on table with n sql statements?	0.00
How to insert values into bridge table (made of 2 Foreign Key rows)...	+0.12
Get all rows where duplicate values exist in several different colu...	-1.94
Need suggestion on optimization query of multiple million of record...	+5.21
Which is the best way to calculate Year/Month in SQL Server?	-2.07
How do I join a column onto a selected query in T-SQL	+0.21
TSQL throwing arithmetic overflow when using parameters, but not wi...	0.00
How to change data with different datetime formats to datetime colu...	+0.23
what will be the result of ltrim or rtrim on whitespace string	0.00
Update a column based on column in the same table	+0.41
T-SQL - execute procedure individual for each row of select stateme...	0.00
One column index vs 2 column index	-2.08
How to automatically generate script using command line in SQL Serv...	0.00
Mysql Query speed takes 50 seconds	-2.41
How to ensure that two transactions have the same version of data?	-3.56