How Do I Select Data From Table With A Particular Column Priority

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SQL-Server-2008R2

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i have table that has rows as below

SQL

DECLARE @Table TABLE
(minv_code INT,
 alert_msg varchar(10),
 alert_time Datetime)

 INSERT INTO @Table VALUES
 (873939, 'Reverse', '7/24/2015 3:31:18'),									
 (873939, 'Tamper',  '7/24/2015 3:30:00'),									
 (873939, 'Meter',   '7/24/2015 3:31:22'), 
 (873940, 'Reverse', '7/24/2015 3:30:00'),
 (873940, 'Tamper',  '7/24/2015 3:31:22')

i want to select the data priority wise
e.g

first row - 873939, 'Meter', '7/24/2015 3:31:22'
second row - 873939, 'Tamper', '7/24/2015 3:30:00'
third row - 873939, 'Reverse', '7/24/2015 3:31:18'
fourth row -873940, 'Tamper', '7/24/2015 3:31:22'      
fifth row - 873940, 'Reverse', '7/24/2015 3:30:00'

Posted 1-Aug-15 7:42am

Member 11829744

Updated 1-Aug-15 8:00am

Wendelius

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PIEBALDconsult 1-Aug-15 14:05pm

Rows in a database have no intrinsic "order"; you need to impose some order on them. In this case, do you want to ORDER BY minv_code and alert_msg?
You will likely need to create a table that defines the "priority" of the alert_msg values.

2 solutions

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Wendelius · Answer 1 · 2015-08-01T08:03:00

One way is to add a table which defines the order messages and use that lookup table to sort the data.

Consider the following

SQL

DECLARE @Table TABLE
(minv_code INT,
 alert_msg varchar(10),
 alert_time Datetime)

 INSERT INTO @Table VALUES
 (873939, 'Reverse', '7/24/2015 3:31:18'),
 (873939, 'Tamper',  '7/24/2015 3:30:00'),
 (873939, 'Meter',   '7/24/2015 3:31:22'),
 (873940, 'Reverse', '7/24/2015 3:30:00'),
 (873940, 'Tamper',  '7/24/2015 3:31:22')

 select a.minv_code, a.alert_msg, a.alert_time
 from @Table a,
      (select 1 as ordinal, 'Meter' as alert_msg union all
       select 2 as ordinal, 'Tamper' as alert_msg union all
       select 3 as ordinal, 'Reverse' as alert_msg) b
where a.alert_msg = b.alert_msg
order by a.minv_code, b.ordinal;

DamithSL · Answer 2 · 2015-08-01T08:18:00

Solution 2

SQL

select * from  Table1 order by minv_code, 
   case when alert_msg ='Meter' then 1
        when  alert_msg ='Tamper' then 2
        when  alert_msg ='Reverse' then 3 end;

DEMO[^]

Posted 1-Aug-15 8:18am

DamithSL