Strings And Identifiers

Kevin Feasel

2018-06-21

Syntax

Kenneth Fisher explains the difference between a string and an identifier:

A common mistake, and one I make frequently myself is to use a string in place of an identifier, or vise-versa. So to start, let’s have some definitions, shall we?

String

a linear sequence of characters, words, or other data.

Identifier

a sequence of characters used to identify or refer to a program or an element, such as a variable or a set of data, within it.

And because I always find examples fairly useful.

Click through for the example as well as additional explanation.

Related Posts

COUNT And NULL Values

Kenneth Fisher digs into the COUNT() function and sees how it deals with NULL values: Count the number of values 1 2 3 SELECT COUNT(FieldName) FROM TableName; -- or SELECT COUNT(ALL FieldName) FROM TableName; The ALL argument is the default and is unnecessary (I didn’t even know it existed until I started this post). Here you are counting […]

Read More

Grouping And Aggregating In SQL, R, And Python

Dejan Sarka has a few examples of aggregation in different languages, including SQL, R, and Python: The query calculates the coefficient of variation (defined as the standard deviation divided the mean) for the following groups, in the order as they are listed in the GROUPING SETS clause: Country and education – expression (g.EnglishCountryRegionName, c.EnglishEducation) Country […]

Read More

Categories

June 2018
MTWTFSS
« May Jul »
 123
45678910
11121314151617
18192021222324
252627282930