diff --git a/README.md b/README.md
index 364f6804..3fbf7d3a 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ func main() {
 }
 ```
 
-Checkout the [SQL documentation](https://chaisql.com/docs/essentials/sql-introduction/), the [Go doc](https://pkg.go.dev/github.com/chaisql/chai) and the [usage example](#usage) in the README to get started quickly.
+Checkout the [Go doc](https://pkg.go.dev/github.com/chaisql/chai) and the [usage example](#usage) in the README to get started quickly.
 
 ### In-memory database
 
@@ -177,4 +177,4 @@ A big thanks to our [contributors](https://github.com/chaisql/chai/graphs/contri
 
 Made with [contrib.rocks](https://contrib.rocks).
 
-For any questions or discussions, join our [Gophers Slack channel](https://gophers.slack.com/messages/CKPCYQFE0) or open an [issue](https://github.com/chaisql/chai/issues/new).
+For any questions or discussions, open an [issue](https://github.com/chaisql/chai/issues/new).
diff --git a/cmd/chai/doc/doc_test.go b/cmd/chai/doc/doc_test.go
index 61f53756..b22ad52e 100644
--- a/cmd/chai/doc/doc_test.go
+++ b/cmd/chai/doc/doc_test.go
@@ -3,6 +3,7 @@ package doc_test
 import (
 	"fmt"
 	"regexp"
+	"strings"
 	"testing"
 
 	"github.com/chaisql/chai/cmd/chai/doc"
@@ -17,13 +18,24 @@ func TestFunctions(t *testing.T) {
 	for pkgname, pkg := range packages {
 		for fname, def := range pkg {
 			if pkgname == "" {
-				t.Run(fmt.Sprintf("%s is documented and has all its arguments mentioned", fname), func(t *testing.T) {
-					str, err := doc.DocString(fname)
-					assert.NoError(t, err)
-					for i := 0; i < def.Arity(); i++ {
-						require.Contains(t, trimDocPromt(str), fmt.Sprintf("arg%d", i+1))
+				var isAlias = false
+				for pkgname2, pkg2 := range packages {
+					if pkgname2 != "" {
+						_, ok := pkg2[strings.ToLower(fname)]
+						if ok {
+							isAlias = true
+						}
 					}
-				})
+				}
+				if !isAlias {
+					t.Run(fmt.Sprintf("%s is documented and has all its arguments mentioned", fname), func(t *testing.T) {
+						str, err := doc.DocString(fname)
+						assert.NoError(t, err)
+						for i := 0; i < def.Arity(); i++ {
+							require.Contains(t, trimDocPromt(str), fmt.Sprintf("arg%d", i+1))
+						}
+					})
+				}
 			} else {
 				t.Run(fmt.Sprintf("%s.%s is documented and has all its arguments mentioned", pkgname, fname), func(t *testing.T) {
 					str, err := doc.DocString(fmt.Sprintf("%s.%s", pkgname, fname))
diff --git a/internal/expr/functions/builtins.go b/internal/expr/functions/builtins.go
index 2c08e4e8..b7ef833a 100644
--- a/internal/expr/functions/builtins.go
+++ b/internal/expr/functions/builtins.go
@@ -81,6 +81,25 @@ var builtinFunctions = Definitions{
 			return &Now{}, nil
 		},
 	},
+
+	// strings alias
+	"lower": stringsFunctions["lower"],
+	"upper": stringsFunctions["upper"],
+	"trim":  stringsFunctions["trim"],
+	"ltrim": stringsFunctions["ltrim"],
+	"rtrim": stringsFunctions["rtrim"],
+
+	// math alias
+	"floor":  mathFunctions["floor"],
+	"abs":    mathFunctions["abs"],
+	"acos":   mathFunctions["acos"],
+	"acosh":  mathFunctions["acosh"],
+	"asin":   mathFunctions["asin"],
+	"asinh":  mathFunctions["asinh"],
+	"atan":   mathFunctions["atan"],
+	"atan2":  mathFunctions["atan2"],
+	"random": mathFunctions["random"],
+	"sqrt":   mathFunctions["sqrt"],
 }
 
 // BuiltinDefinitions returns a map of builtin functions.
diff --git a/internal/expr/functions/math.go b/internal/expr/functions/math.go
index 4315d932..8606a763 100644
--- a/internal/expr/functions/math.go
+++ b/internal/expr/functions/math.go
@@ -184,7 +184,7 @@ var sqrt = &ScalarDefinition{
 		if args[0].Type() != types.DoubleValue && args[0].Type() != types.IntegerValue {
 			return types.NewNullValue(), nil
 		}
-		v, err := document.CastAs(args[0], types.DoubleValue)
+		v, err := object.CastAs(args[0], types.DoubleValue)
 		if err != nil {
 			return nil, err
 		}