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Real life example, when to use OUTER / CROSS APPLY in SQL
... WHERE pa.object_id = pr.object_id
ORDER BY pr.name) pa
ORDER BY pr.name,
pa.name
2) Calling a Table Valued Function for each row in the outer query
SELECT *
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle)
...
How do you find the disk size of a Postgres / PostgreSQL table and its indexes
...ema || '"."' || table_name || '"')) AS size
FROM information_schema.tables
ORDER BY
pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC;
Edit: Here's the query submitted by @phord, for convenience:
SELECT
table_name,
pg_size_pretty(table_size) AS table_size,...
RSpec: describe, context, feature, scenario?
...ike this:
#
# The feature/behaviour I'm currently testing
#
describe "item ordering" do
# 1st state of the feature/behaviour I'm testing
context "without a order param" do
...
end
# 2nd state of the feature/behaviour I'm testing
context "with a given order column" do
..
end
...
How to check date of last change in stored procedure or function in SQL server
...
SELECT name, create_date, modify_date
FROM sys.objects
WHERE type = 'P'
ORDER BY modify_date DESC
The type for a function is FN rather than P for procedure. Or you can filter on the name column.
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When should I use Lazy?
...ou have an entity Customer which has properties for Name, PhoneNumber, and Orders. Name and PhoneNumber are regular strings but Orders is a navigation property that returns a list of every order the customer ever made.
You often might want to go through all your customer's and get their name and ph...
Access an arbitrary element in a dictionary in Python
...te that "first" may not be an appropriate term here because dict is not an ordered type in Python < 3.6. Python 3.6+ dicts are ordered.
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What are the differences between a clustered and a non-clustered index?
...le
Faster to read than non clustered as data is physically stored in index order
Non Clustered Index
Can be used many times per table
Quicker for insert and update operations than a clustered index
Both types of index will improve performance when select data with fields that use the index but...
SQL JOIN - WHERE clause vs. ON clause
...
They are not the same thing.
Consider these queries:
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
WHERE Orders.ID = 12345
and
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
AND Orders.ID = 12345
The first will return an order ...
How to flatten tree via LINQ?
...Flatten(node => node.Elements);
If you would prefer flattening in pre-order rather than in post-order, switch around the sides of the Concat(...).
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C# Sort and OrderBy comparison
I can sort a list using Sort or OrderBy. Which one is faster? Are both working on same
algorithm?
7 Answers
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