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What columns generally make good indexes?
...ut indexes, what columns are good index candidates? Specifically for an MS SQL database?
12 Answers
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Check if a Postgres JSON array contains a string
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As of PostgreSQL 9.4, you can use the ? operator:
select info->>'name' from rabbits where (info->'food')::jsonb ? 'carrots';
You can even index the ? query on the "food" key if you switch to the jsonb type instead:
alter tabl...
What is the basic difference between the Factory and Abstract Factory Design Patterns? [closed]
...erent contexts. Examples could be different factories for different OS'es, SQL providers, middleware-drivers etc..
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What data type to use for hashed password field and what length?
...).
$2y$10$.vGA1O9wmRjrwAVXD98HNOgsNpDczlqm3Jq7KnEd1rVAGv3Fykk1a
Use the SQL data type CHAR(60) to store this encoding of a Bcrypt hash. Note this function doesn't encode as a string of hexadecimal digits, so we can't as easily unhex it to store in binary.
Other hash functions still have uses, bu...
Which encoding opens CSV files correctly with Excel on both Mac and Windows?
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This works well for SQL data exports with diacritics.
– motorbaby
Nov 15 '16 at 16:31
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List tables in a PostgreSQL schema
When I do a \dt in psql I only get a listing of tables in the current schema ( public by default).
4 Answers
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Does anyone have benchmarks (code & results) comparing performance of Android apps written in Xamari
...Mono actually accesses the disk.
It is also telling that our C# code uses SQLite.NET (https://github.com/praeclarum/sqlite-net). Identical fetches using the SQLite.NET code are also 2x slower than using Android's Java SQLite wrapper. After looking at the source code, it appears to bind directly to ...
How can I preview a merge in git?
... TableAudit/Step1_PopulateRawTableList.sh
A manbuild/staff_companies.sql
M update-all-slave-dbs.sh
or if you want a diff from your head to the remote:
$ git fetch origin
$ git diff origin/master
IMO this solution is much easier and less error prone (and therefore much less risky) ...
How to find duplicates in 2 columns not 1
I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they should never have a duplicate of BOTH of them having the same value.
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Django filter queryset __in for *every* item in list
... It would cool to switch "__in" to "__all" and have it create the correct sql query.
– t1m0
Jan 18 '17 at 16:06
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