选择查询以限制编号。 mysql的行和列数

Question

I have a MySQL table named city_map . I want to display only the given fields in the snapshot in red rectangale.

Suppose the sl_no is given as 1 to 4, how do I get the required output?

I am trying with this query:

select * from city_map where sl_no between 1 and 4

And I'm getting the first 4 rows but I only want to display the columns Hyderabad , Itanagar , Dispur and Patna .

Answer 1

尝试这个 ：

select sl_no,capital,Hyderabad,Itanagar,Dispur,Patna from city_map where sl_no between 1 and 4

Answer 2

Use the variable names in the query and pass the value from method as query parameter,

SELECT sl_no,capital,Hyderabad,Itanagar,Dispur,Patna 
FROM city_map WHERE sl_no BETWEEN :slNoFrom AND :slNoTo ORDER BY sl_no

try using String.format as,

String.format(yourQuery,
 NEW Object[]{ColumnName1,ColumnName2,ColumnName3,ColumnName4,ColumnName5}

and use %s as a placeholder in a query,

 SELECT sl_no,%s,%s,%s,%s,%s
 FROM city_map WHERE sl_no BETWEEN :slNoFrom AND :slNoTo ORDER BY sl_no

Answer 3

使用简单的查询：

select sl_no,capital,Hyderabad,Itanagar,Dispur,Patna from city_map where sl_no between 1 and 4