In my last blog I explained what a columnstore index is, in this blog, we will dive into creating a clustered columnstore index and look at the performance differences...
2019-07-31 (first published: 2019-07-10)
555 reads
Recently I reviewed filtered indexes, this time let’s look at columnstore indexes. These indexes are very useful for data warehouse workloads and large tables. They can improve query performance...
2019-07-11 (first published: 2019-06-26)
1,278 reads
When you run a query twice, and get dramatically different run times, your first step can be to try to identify the differences in execution plans. For many that...
2019-07-05 (first published: 2019-06-19)
931 reads
In this post, we continue with another beginner’s blog of database features that may be unknown to many. Let’s take a look at filtered indexes. Many database administrators are...
2019-06-10 (first published: 2019-05-22)
767 reads
I give performance presentations at many different events to all levels of SQL Server professionals. Over time I’ve noticed that some DBAs and developers have never looked at the...
2019-05-29 (first published: 2019-05-15)
2,097 reads
I am very excited to announce I will be delivering a pre-conference session on SQL Server Performance Tuning on November 5th at PASS Summit 2019. If you have ever...
2019-04-24
87 reads
Another quick post of simple changes you can make to your code to create more optimal execution plans. This one is on implicit conversions. An implicit conversion is when...
2019-04-29 (first published: 2019-04-17)
1,147 reads
One of the easiest things to fix when performance tuning queries are Key Lookups or RID Lookups. The key lookup operator occurs when the query optimizer performs an index...
2019-04-17 (first published: 2019-04-03)
726 reads
March is Women’s History Month, to celebrate the PASS Women in Technology Virtual Group (@PASS_WIT) held a webcast featuring prominent...
2019-04-09 (first published: 2019-03-20)
1,036 reads
I’ve seen many people go through the trouble of setting up database mail and configuring SQL Agent Alerts only to...
2019-03-13
266 reads
It's time for T-SQL Tuesday #198! This month's topic is change detection. The post T-SQL...
By James Serra
Model Context Protocol, or MCP, is one of those technical ideas that sounds more...
When starting with AWS RDS Aurora for managing relational databases in the cloud, many...
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I have this data in a table called dbo.NFLTeams
TeamID TeamName City YearEstablished ------ -------- ---- --------------- 1 Cowboys Dallas 1960 2 Eagles Philadelphia 1933 3 Packers Green Bay 1919 4 Chiefs Kansas City 1960 5 49ers San Francisco 1946 6 Broncos Denver 1960 7 Seahawks Seattle 1976 8 Patriots New England 1960If I run this code, how many rows are returned?
SELECT TOP 2
json_objectagg('Team' : TeamName)
FROM dbo.NFLTeams;
See possible answers