SQL Syntax.

Sql, Or Structured Query Language, Is A Programming Language Used To Manage And Manipulate Relational Databases. Here Are Some Important Features Of Sql Syntax And Writing Sql Statements:

1. Sql Keywords: Sql Has A Set Of Reserved Words That Have A Specific Meaning And Cannot Be Used As Variable Names Or Identifiers. Examples Of Sql Keywords Include Select, From, Where, Insert, Update, Delete, And Many Others.

2. Sql Is Not Case Sensitive: Sql Statements And Keywords Can Be Written In Uppercase Or Lowercase Letters, And Sql Is Not Case Sensitive. For Example, The Sql Statements "Select" And "Select" Are Equivalent.

3. Sql Comments: Sql Supports Two Types Of Comments: Single-line Comments And Multi-line Comments. Single-line Comments Start With "--" And Continue Until The End Of The Line, While Multi-line Comments Start With "/*" And End With "*/".

4. Sql Commands: Sql Commands Are Used To Perform Various Operations On A Database. Some Common Sql Commands Include Select, Insert, Update, Delete, Create, Drop, And Alter.

5. Writing Sql Statements: Sql Statements Are Used To Retrieve, Insert, Update, Or Delete Data In A Database. A Typical Sql Statement Consists Of A Keyword, A List Of Columns Or Tables, And A Set Of Conditions. For Example, The Following Sql Statement Selects All Records From A Table Named "Customers" Where The "Country" Column Is Equal To "Usa":

   Select * From Customers Where Country = 'usa';

It's Important To Note That The Syntax And Structure Of Sql Statements Can Vary Depending On The Specific Database Management System Being Used, Such As Oracle, Mysql, Or Sql Server. It's Always Recommended To Refer To The Documentation And Resources Provided By The Database Management System For Specific Information On Syntax And Usage.