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