diff --git a/sql/data.go b/sql/data.go
index abc63b54..fc16d2ea 100644
--- a/sql/data.go
+++ b/sql/data.go
@@ -105,13 +105,11 @@ func (p *parser) parseDiff() (exp []Expr, err error) {
 		return nil, &ParseError{Found: lit, Expected: []string{"json"}}
 	}
 
-	val, err := p.declare(tok, lit)
+	one.JSON, err = p.declare(tok, lit)
 	if err != nil {
 		return nil, &ParseError{Found: lit, Expected: []string{"json"}}
 	}
 
-	one.JSON = val
-
 	exp = append(exp, one)
 
 	return
@@ -127,13 +125,11 @@ func (p *parser) parseMerge() (exp []Expr, err error) {
 		return nil, &ParseError{Found: lit, Expected: []string{"json"}}
 	}
 
-	val, err := p.declare(tok, lit)
+	one.JSON, err = p.declare(tok, lit)
 	if err != nil {
 		return nil, &ParseError{Found: lit, Expected: []string{"json"}}
 	}
 
-	one.JSON = val
-
 	exp = append(exp, one)
 
 	return
@@ -149,13 +145,11 @@ func (p *parser) parseContent() (exp []Expr, err error) {
 		return nil, &ParseError{Found: lit, Expected: []string{"json"}}
 	}
 
-	val, err := p.declare(tok, lit)
+	one.JSON, err = p.declare(tok, lit)
 	if err != nil {
 		return nil, &ParseError{Found: lit, Expected: []string{"json"}}
 	}
 
-	one.JSON = val
-
 	exp = append(exp, one)
 
 	return