diff --git a/parser/src/core.rs b/parser/src/core.rs
index 1f97797..248c5c6 100644
--- a/parser/src/core.rs
+++ b/parser/src/core.rs
@@ -1,12 +1,15 @@
 use minisql::{operation::Operation, schema::TableSchema};
 use nom::{branch::alt, multi::many0, IResult};
+use thiserror::Error;
 
 use crate::{parsing::{create::parse_create, delete::parse_delete, index::parse_create_index, insert::parse_insert, select::parse_select}, validation::{validate_operation, ValidationError}};
 
-#[derive(Debug)]
+#[derive(Debug, Error)]
 pub enum Error {
+    #[error("parsing error: {0}")]
     ParsingError(String),
-    ValidationError(ValidationError)
+    #[error("validation error: {0}")]
+    ValidationError(#[from] ValidationError)
 }
 
 pub fn parse_statement<'a>(input: &'a str) -> IResult<&str, Operation> {
@@ -31,7 +34,7 @@ pub fn parse_and_validate(query: String, db_metadata: &Vec<(String, &TableSchema
             Error::ParsingError(err.to_string())
         })?;
 
-    validate_operation(&op, db_metadata).map_err(|err| Error::ValidationError(err))?;
+    validate_operation(&op, db_metadata)?;
     Ok(op)
 }
 
diff --git a/parser/src/parsing/common.rs b/parser/src/parsing/common.rs
index 23fb866..f71d587 100644
--- a/parser/src/parsing/common.rs
+++ b/parser/src/parsing/common.rs
@@ -32,12 +32,12 @@ pub fn parse_column_name(input: &str) -> IResult<&str, String> {
 }
 
 pub fn parse_db_type(input: &str) -> IResult<&str, DbType> {
-    let (input, type_name) = alt((tag("STRING"), tag("INT"), tag("Float"), tag("UUID")))(input)?;
+    let (input, type_name) = alt((tag("STRING"), tag("INT"), tag("NUMBER"), tag("UUID")))(input)?;
     let db_type = match type_name {
         "STRING" => DbType::String,
         "INT" => DbType::Int,
         "UUID" => DbType::Uuid,
-        "Float" => DbType::Number,
+        "NUMBER" => DbType::Number,
         _ => return Err(nom::Err::Failure(make_error(input, nom::error::ErrorKind::IsNot)))
     };
     Ok((input, db_type))
diff --git a/parser/src/validation.rs b/parser/src/validation.rs
index d978c0c..870b11a 100644
--- a/parser/src/validation.rs
+++ b/parser/src/validation.rs
@@ -1,19 +1,32 @@
 
 use std::collections::HashSet;
+use thiserror::Error;
 
 use minisql::{operation::{ColumnSelection, Condition, InsertionValues, Operation}, schema::{TableSchema, ColumnName, TableName}, type_system::DbType};
 
 
-#[derive(Debug)]
+#[derive(Debug, Error)]
 pub enum ValidationError {
+    #[error("table {0} does not exist")]
     TableDoesNotExist(TableName),
+    #[error("table {0} already exists")]
     TableAlreadyExists(TableName),
+    // TODO
+    // #[error("columns {0} do not exist")]
+    #[error("columns do not exist")]
     ColumnsDoNotExist(Vec<ColumnName>),
-    DuplicateColumn(String),
+    #[error("duplicate column {0}")]
+    DuplicateColumn(ColumnName),
+    // TODO: You need to actually print the error message
+    #[error("type mismatch")]
     TypeMismatch(TypeMismatch),
+    // TODO
+    // #[error("values for required columns {0} are missing")]
+    #[error("values for required columns are missing")]
     RequiredColumnsAreMissing(Vec<ColumnName>)
 }
 
+// TODO: Add derive(Error)
 #[derive(Debug)]
 pub struct TypeMismatch {
     pub column_name: ColumnName,