OR运算符无法在查询sqlite iphone中工作

Question

I am using Join operator to check two values in table but it does not work

select = [[NSString alloc] initWithFormat:@"select * FROM ContentMaster LEFT JOIN  Category  ON  ContentMaster.CategoryID= Category.CategoryID where ContentMaster.ContentTitle='%@' || ContentMaster.ContentTagText='%@' ",appDelegate.tagInput,appDelegate.tagInput];

If i do not use operator and use one in where clause then it shows result.

like

select = [[NSString alloc] initWithFormat:@"select * FROM ContentMaster LEFT JOIN  Category  ON  ContentMaster.CategoryID= Category.CategoryID where ContentMaster.ContentTitle='%@'",appDelegate.tagInput];


select = [[NSString alloc] initWithFormat:@"select * FROM ContentMaster LEFT JOIN  Category  ON  ContentMaster.CategoryID= Category.CategoryID where ContentMaster.ContentTagText='%@'",appDelegate.tagInput];

Any idea how to fix this issue so that or operator works

Answer 1

In SQL (and SQLite in particular), operator || typically means string concatenation.

If you want logical or , use operator OR .

Answer 2

In sqlite just use or for logical or operation:

SELECT * 
FROM ContentMaster 
LEFT JOIN  Category ON ContentMaster.CategoryID = Category.CategoryID 
WHERE ContentMaster.ContentTitle = '%@' OR ContentMaster.ContentTagText= '%@'