sqlite 字符串拼接

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

用'||'拼接字符串spa

好比path是/1001/的话 那结果就是/1001/%ip

 

数字相加字符串

SELECT 'A'+'B'  结果为0it

SELECT "A"+"1"  结果为1io

SELECT "A"+1   结果为1class

SELECT 2+1  结果为3select

=在“+”运算中,SQLite将字符串非数字串都看成0处理了tab

 

||  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
vi

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