custom column with switch statement

[indhu]

Hi, 

I would like to know if there is any way to create a custom column with a switch statement.

Requirement -> I have a date column and wanted to calculate the day of week column with a name. I was able to do it with calculated column but wanted to know if there is any way to create using custom column?

Query used for calculated column -> 

Weekday = SWITCH(

                 WEEKDAY(table[timestamp.[Date],2),           

                 1,"1.Monday",

                 2,"2.Tuesday",

                 3,"3.Wednesday",

                 4,"4.Thursday",

                 5,"5.Friday",

                 6,"6.Saturday",

                 7,"7.Sunday")

Thanks,

Indhu.

[Phil_Seamark]

Hi @indhu

You could try this syntax

Weekday = FORMAT('Table'[Date],"DDDD")

[indhu]

Thanks @Phil_Seamark

Actually, I have a date column which i am transforming in the following way,

1. Duplicate the actual date column

2. calculate the day of the week by right click -> Transform -> day -> day of week

Now I have a column with a day of the week in numbers and wanted to transform that into the name. One option will be to use replace values option. But I feel it is not an efficient way to do it.

Following your previous post, 

= Table.DuplicateColumn(#"Renamed Columns2", "timestamp", "timestamp - Copy")

This will be the actual code and when using the format option with this,

= Table.DuplicateColumn(#"Renamed Columns2", "timestamp", format("timestamp - Copy","DDDD")

 I know something is wrong but can't find out what it is can you please put me in the right direction?

Thanks,

[anithat]

Hi Indhu

Have you tried to select "Name of Day" in the Transform option.

1. Duplicate the actual date column

2. calculate the day of the week by right click -> Transform -> day -> day of week  Name of Day

Is that what you are Expecting?

[indhu]

@anithat thanks for your reply. What you mentioned will fetch day name in text. This is what i expect but this makes sorting difficult. 

The above result will only allow us to sort by alphabet which makes visuals weird. I wanted the visual to be ordered beginning from Monday. For this purpose, I used switch statement by manually using numbers at the beginning like "1.Monday". 

I did this in a calculated column. Now trying to figure out in a custom column

Thanks,

[anithat]

@indhu

 create two columns

Day of Week which gives numeric value

Name of Day which gives Name

Apply & close

Go to  'Data' or 'Report' tab (on left side )

Go to 'Modelling' tab  (on Top)

Choose the column "Name of Day"

Click on 'Sort by Column'

From the dropdown list choose "Day of Week" and that will sort the "Name of Day"  by "Day of Week"

[indhu]

@anithat thanks for your suggestion. The database is very huge and the refresh time now takes about 20-30 mins. I reckon adding one more column will add up the load. 

Is there any way I can use the switch statement in power query? 

I will test the refresh time for both as well. 

[anithat · Accepted solution]

@indhu

Then the Switch statement that you mentioned is working perfect right?

In this case as well, create two columns 

Name of Day

 = SWITCH(
                 WEEKDAY(table[Date],2),         
                 1,"Monday",
                 2,"Tuesday",
                 3,"Wednesday",
                 4,"Thursday",
                 5,"Friday",
                 6,"Saturday",
                 7,"Sunday")

and 

Day of Week = WEEKDAY(table[Date],2)

Then use Sort by column option as suggested before.

[indhu]

thanks @Phil_Seamark. 

Actually, I have a date column and transformed that into a calculated day of the week by following,

1. Duplicated the column

2. right click -> transform -> Day -> day of week

after the above step i have this formula in the bar,

= Table.TransformColumns(#"Duplicated Column",{{"timestamp - Copy", Date.DayOfWeek, Int64.Type}}).

If I follow as you suggested, 

= Table.TransformColumns(#"Duplicated Column",format{{"timestamp - Copy", Date.DayOfWeek, Int64.Type,"DDDD"}}).

This doesn't work. I know I am missing something stupid. Can you please help?

I read in a post that custom column is more efficient than a calculated column. So thought I can try that

Thanks again,

Indhu