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  • sqlite 字符串拼接

    select path || '%'  from t_category where depth = 0 and type = 0

    用'||'拼接字符串

    比如path是/1001/的话 那结果就是/1001/%

     

    数字相加

    SELECT 'A'+'B'  结果为0

    SELECT "A"+"1"  结果为1

    SELECT "A"+1   结果为1

    SELECT 2+1  结果为3

    =在“+”运算中,SQLite将字符串非数字串都当作0处理了

     

    ||  String Concatenation
    Arithmetic Multiply
    Arithmetic Divide
    Arithmetic Modulus
    Arithmetic Add
    –  Arithmetic Subtract
    <<  Bitwise Right shift
    >>  Bitwise Left shift
    Logical And
    Logical Or
    Relational Less than
    <=  Relational Less than or equal to
    Relational Greater than
    >=  Relational Greater than or equal to
    Relational Equal to
    ==  Relational Equal to
    <>  Relational Not equal to
    !=  Relational Not equal to
    IN  Logical In
    AND  Logical And
    OR  Logical Or
    LIKE  Relational String matching
    GLOB  Relational Filename matching

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  • 原文地址:https://www.cnblogs.com/gsk99/p/7803566.html
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