How To Use Identifiers, think sql In SQL

sql - identifiers, think sql

In previous chapter i have explained How To Use UNION Command In SQL now i am gonna eplain you How To Use Identifiers, think sql In SQL

As with any programming language, there are a few terms unique to SQL.

An Identifier is essentially a name of a database, table, or table column. As the creator of the database, you are free to identify these objects as you please; we merely suggest you keep these guidelines in mind when you do.

• Develop your own unique naming scheme. -- Use terms that relate to one another and will be easy to recognize apart from your code.
• Be conscious of how long your names become. -- Especially be aware when the time comes to name your columns.
• Avoid names without meaning. -- Develop a working scheme that also has meaning behind the names.
• Be consistent. -- If you capitalize one table name, capitalize each table name; if you choose to use abbreviations, make sure they do not have double meanings or ambiguous meaning.

Develop a clear, concise schema, and stick to it as your database develops.

sql - literals

Literal is a term for data types such as strings, numbers, or boolean values in SQL. These values are not named by you the programmer; they just exist.

Literal Breakdown:

string literals
'This is a string value'
'5893 Moon River Dr.'

number literals
823
-4.5
3.387920

boolean literals
TRUE
FALSE
1
0