Change Password

Please enter the password.
Please enter the password. Between 8-64 characters. Not identical to your email address. Contain at least 3 of uppercase, lowercase, numbers, and special characters (such as @*&#).
Please enter the password.
Submit

Change Nickname

Current Nickname:
Submit

v4.2
Search
中文EN
v4.2

    Operator | Precedence

    Operator

    • Conditional operators
    Operator Description
    @ schema checker
    == equal
    != not equal
    < less than
    > greater than
    <= less than or equal
    >= greater than or equal
    <> between
    <=> between or equal
    in belong to
    nin not belong to
    contains contain / full-text search
    =~ regular expression

    The operands for conditional operation must be consistent with the definitions of conditional operators to determine true or false:

    • Logic operators
    Operator Description
    && and
    || or
    ! not
    xor exclusive OR

    Both operands and results of logical operation are either true or false.

    • Numeric operators
    Operator Description
    + addition
    - subtraction
    * multiplication
    / division
    % modulo (the remainder of division)

    Precedence

    The following table shows the precedence of conditional operators, logic operators and numeric operators (1 represents the highest):

    Precedence Operator Category
    1 ( ), [ ]
    2 @ conditional operator
    3 ! logic operator
    4 *, /, % numeric operator
    5 +, - numeric operator
    6 >, <, >= , <= , <> , <=>, in, nin, contains conditional operator
    7 == , != conditional operator
    8 && logic operator
    9 xor, || logic operator
    Please complete the following information to download this book
    *
    公司名称不能为空
    *
    公司邮箱必须填写
    *
    你的名字必须填写
    *
    你的电话必须填写
    *
    你的电话必须填写