# Geeks on Campus

## PS Query Expressions

Posted by jeggent on June 29, 2020

I’m using this to join to the roll name on PSROLEUSER  so I can then get the user’s actual name.

Expression for First Generation (C = ISIR_PARENT)

CASE WHEN (C.FATHER_GRADE_LVL IN (‘ ‘, ‘4’) AND C.MOTHER_GRADE_LVL IN (‘ ‘, ‘4’)) THEN ‘Unknown’
ELSE ‘Yes’
END

Decode, Substr, To_number and Least

CASE WHEN L.OFFER_BALANCE > 0
THEN 0
WHEN K.OFFER_BALANCE > 0
THEN DECODE(E.VARIABLE_CHAR4,’NO NEED’,LEAST(250,TO_NUMBER(SUBSTR(A.FLD1,12,5))), ‘HIGH’,LEAST(500,TO_NUMBER(SUBSTR(A.FLD1,12,5))), ‘MODERATE’,LEAST(500,TO_NUMBER(SUBSTR(A.FLD1,12,5))), ‘LOW’,LEAST(500,TO_NUMBER(SUBSTR(A.FLD1,12,5))), 0)
ELSE DECODE(E.VARIABLE_CHAR4,’HIGH’,LEAST(1200,TO_NUMBER(SUBSTR(A.FLD1,12,5))), ‘MODERATE’,LEAST(1000,TO_NUMBER(SUBSTR(A.FLD1,12,5))), ‘LOW’,LEAST(750,TO_NUMBER(SUBSTR(A.FLD1,12,5))), ‘NO NEED’,LEAST(500,TO_NUMBER(SUBSTR(A.FLD1,12,5))), 0)
END

Here is an interesting expression that uses a few different functions. If the student has already been awarded in this term (l.offer_balance > 0) then the result is 0. If the student has previously been awarded (k.offer_balance > 0), then a decode is used to evaluate the value in e.variable_char4. If there is no current or prior offer_balance then a different version of the decode statement is used. The decode works like this:

LEAST(1200,TO_NUMBER(SUBSTR(A.FLD1,12,5)))
The least statement returns whichever is lower, the number (ex. 1200) or the result of TO_NUMBER(SUBSTR(A.FLD1,12,5)). The substr statement is pulling 5 characters out of the field A.FLD1 starting at position 12. Then to_number converts that to a number for comparison in the least function.

MOD and FLOOR for a file extract

This is for an odd case where a file layout calls for no fractional digits on whole number amounts. ex. 123.45 = 123.45 : 678.00 = 678

CASE WHEN MOD(A.DISBURSED_BALANCE,1) > 0
THEN TO_CHAR(A.DISBURSED_BALANCE)
ELSE TO_CHAR(FLOOR(A.DISBURSED_BALANCE))
END

Getting Calendar Year from Term Code

Calculating age at time of application

Removing non-number characters from phone number to compare ISIR phone number to Campus Community

CONCAT(SUBSTR(H.PHONE,1,3),CONCAT(SUBSTR(H.PHONE,5,3),SUBSTR(H.PHONE,9,4)))

Reformatting a 2020/11/06 date to 11/06/2020

Compare a date field to a date last year
I.COMM_DT > TO_DATE(CONCAT(TO_NUMBER(:1)-1,’-02-01′),’YYYY-MM-DD’)

Get the date from a DateTime field
TO_CHAR(CAST((A.COMM_DTTM) AS TIMESTAMP), ‘MM/DD/YY’)
Also check out the EXTRACT function if you just need one element (day, month, etc).

String Theory
CONCAT(SUBSTR(D.FLD4, 1, INSTR(D.FLD4, ‘ ‘)), ‘Meal Plan’)
Using CONCAT, INSTR, and SUBSTR to turn the input string “Silver BOTH swipes & falcon dollars (custom)” to the output string “Silver Meal Plan”.
CONCAT attaches two strings together. SUBSTR is used to extract just the beginning of the input string up to the first space (found by INSTR).