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  • SQL Database

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    SQL follow the unique set of rules that is called syntax ,follow the rules given below
    SQL database is not a case sensitive . Generally in SQL database keywords are written in uppercase SQL statements are dependent on text lines .
    You can do task in a database with SQL statements .
    SQL depends on relational algebra .
    What is SQL statement ?
    SQL statements is started with any of the SQL commands/keywords like select , insert , update , alter etc and that statement should be end with semicolon .
    Example of SQL statement :

    select **column-name** from **table-name**
    

    In this semicolon indicate the end of statement .
    SQL database support various data types , list is given below
    integer -> For integer number .
    smallint -> For small integer number .
    Numeric -> Numeric ( p , s ) where p is precision and s is scale value .
    real -> single precision floating point number .
    decimal -> Decimal ( p , s ) where p is precision and s is scale value .
    double precision -> Double precision floating point number .
    float -> * Float (P) where p is precision .
    *
    character ->
    char ( x ) where x is the character number to store .
    character varying -> varchar2(x) where x is the character number to store .
    Bit -> Bit ( x ) where x is the number of bits to store .
    Date -> It is used to store year, month and days values .
    Time -> It is used to store hour , month , day , hour , minute and second values . etc

    SQL Arithmetic operator -> + operator -> It is used to add both the operands .
    Example ->

    If a=10 and b=5 then a + b = 15 ;
    

    - opertor -> It is used to subtract both the operands .
    Example ->

    If a=10 and b=5 then a - b = 5 ;
    

    * opertor -> It is used to multiply both the operands .
    Example ->

    If a=10 and b=5 then a * b =50 ;
    

    / opertor -> It is used to divide both the operands .
    Example ->

    If a=10 and b=5 then a / b = 2 ;
    

    % opertor -> It divide left hand operand by right hand operand and return the remainder .
    Example ->

    If a=10 and b=5 then a % b = 0 ;
    

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