join constraints with comma

d2graph/d2graph.go

@@ -1037,7 +1037,7 @@ func (obj *Object) GetDefaultSize(mtexts []*d2target.MText, ruler *textmeasure.R
 			maxTypeWidth = go2.Max(maxTypeWidth, typeDims.Width)
 
 			if l := len(c.Constraint); l > 0 {
-				// 60 covers UNQ constraint with padding, 40 for further constraints covers UNQ + space
+				// 60 covers UNQ constraint with padding, 40 for further constraints covers UNQ + comma + space
 				if newWidth := 60 + 40*(l-1); newWidth > constraintWidth {
 					constraintWidth = newWidth
 				}

d2target/sqltable.go

@@ -60,5 +60,5 @@ func (c SQLColumn) ConstraintAbbr() string {
 		abbrs = append(abbrs, abbr)
 	}
 
-	return strings.Join(abbrs, " ")
+	return strings.Join(abbrs, ", ")
 }