Replacing string in sql query

Question

This is how I retrieve data

select myPlan from myTable

this is result ,

        myPlan
=====================
True  , False , True
False , True  , False
False , True  , True

In each row , I have three Boolean value separated by comma .
The first Boolean value represent Breakfast , the second is Lunch and the last is Dinner .

I just want to replace the result to

        myPlan
=====================
BreakFast , Dinner
Lunch
Lunch , Dinner

Can I make this replacement by using only sql query ? I'm using SQL server 2008 R2 !

Answer 1

Since you have just 3 booleans you could use a case statement for all 8 possibilities.

SELECT
    (CASE
    WHEN myPlan = 'True , True , True'
    THEN 'Breakfast, Lunch, Dinner'
    WHEN myPlan = 'True , True , False'
    THEN 'Breakfast, Lunch'
    WHEN myPlan = 'True , False , False'
    THEN 'Breakfast'
    WHEN myPlan = 'True , False , True'
    THEN 'Breakfast, Dinner'
    WHEN myPlan = 'False , False , True'
    THEN 'Dinner'
    WHEN myPlan = 'False , True , True'
    THEN 'Lunch, Dinner'
    WHEN myPlan = 'False , True , False'
    THEN 'Lunch'
    ELSE ''
    END) myPlan
FROM myTable

Answer 2

You can use string functions as follows.

DECLARE @TEMP AS TABLE(MyPlan VARCHAR(100))

INSERT INTO @TEMP(MyPlan) VALUES ('True  , False , True')
INSERT INTO @TEMP(MyPlan) VALUES ('False , True  , False')
INSERT INTO @TEMP(MyPlan) VALUES ('False , True  , True')

SELECT

     CASE 
        WHEN RTRIM(SUBSTRING(MyPlan,1,5)) = 'TRUE' THEN 'BREAKFAST'
        ELSE '' 
    END 
    +CASE 
        WHEN RTRIM(SUBSTRING(MyPlan,9,5)) = 'TRUE' THEN ',LUNCH'
        ELSE '' 
    END 
    +CASE 
        WHEN RTRIM(SUBSTRING(MyPlan,17,5)) = 'TRUE' THEN ',DINNER'
        ELSE '' 
    END 

FROM @TEMP

Answer 3

A shorter solution:

select 
decode(substr(myPlan,0,1),'T','Breakfast',null) ||  decode(substr(myPlan,0,1),'T',' , ',null) ||
decode(substr(myPlan,9,1),'T','Lunch',null) ||  decode(substr(myPlan,9,1),'T',' , ',null) ||
decode(substr(myPlan,17,1),'T','Dinner',null) 
from mytable;