Concatenate 'A' with SQL query -

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How do I use SQL queries with a field, and if '90' and '99' in the field, its result Will A join?

The final output will look like this. 

  91 A92A 93A 94A 95A

I tried the following. 

  SELECT tblgrade.fld1stGrade, 'A' tblgrade WHERE tblgrade.fld1stGrade '90' and '99'

If your implementation is in the SQL server, then follow the following. 

  SELECT tblgrade.fld1stGrade + 'A' to tblgrade where CAST (tblgrade.fld1stGrade int) & gt; = 90 and Cast (as tblgrade.fld1stGrade int) & lt; = 99;

MySQL implementation is used for the following. 

  Select tblgrade from tblgrade.fld1stGrade & gt; Select = 90 and tblgrade to concat (tblgrade.fld1stGrade, 'A') .fld1stGrade & lt; = 99;

For comparison of multiple categories in MySQL, use something like the following.

Select 
  when tblgrade.fld1stGrade & gt; = 90 and tblgrade.fld1stGrade & lt; = 99 then Context (tblgrade.fld1stGrade, 'A') when tblgrade.fld1stGrade & gt; = 80 and tblgrade.fld1stGrade & lt; = 89 then concat (tblgrade.fld1stGrade, 'B') when tblgrade.fld1stGrade & gt; = 70 and tblgrade. Fld1stGrade & lt; = 79 then concat (tblgrade.fld1stGrade, 'C') and end with the concert (description, 'D') grades as support;

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