66 Data Cheat Sheets
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66 Cheat Sheets tagged with Data
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DRAFT: Cleaning Data with SQL Cheat SheetSummarizing the key SQL statements
Missing data:
WHERE IS NOT NULL
WHERE IS NULL
COUNT(*) GROUP BY ORDER BY
String Functions:
SUBSTRING(), LTRIM(), RTRIM(), LEFT(), RIGHT(), CHARINDEX(), LEN(), ISNUMERIC(), ISDATE()
Set Operations
EXCEPT/MINUS
INTERSECT
UNION
Dropping Duplicates
row_number() OVER ( PARTITION BY
WHERE > 1
Replace Through Regular Expressions
CASE with LIKE
30 Sep 22
DRAFT: R Problem Solutions Cheat SheetThese are problems I encounter frequently enough to have looked for a solution before, but not so frequently that I remember how to solve them without scratching my head over it.
2 Jul 22
DRAFT: Intro. to Computer Architecture and Organization Cheat SheetMain topics for Quiz #2: Ch. 5 program performance: understand the blockers, with examples of each, and the main solutions at this level, also the bounds on the measures of performance; Ch. 6 The memory hierarchy: disks, all cache; Ch. 7: Linking: very limited coverage, essentially, symbols and what the linker does with each type, the process of linking, and Ch. 8 Exceptional control flow up to what we covered on Lecture #12.
21 Nov 22
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