diff --git a/lib/src/dbs/auth.rs b/lib/src/dbs/auth.rs
index a2097c8e..51ef1d03 100644
--- a/lib/src/dbs/auth.rs
+++ b/lib/src/dbs/auth.rs
@@ -23,6 +23,15 @@ impl Default for Auth {
 }
 
 impl Auth {
+	pub fn perms(&self) -> bool {
+		match self {
+			Auth::No => true,
+			Auth::Sc(_, _, _) => true,
+			Auth::Db(_, _) => false,
+			Auth::Ns(_) => false,
+			Auth::Kv => false,
+		}
+	}
 	pub fn check(&self, level: Level) -> bool {
 		match self {
 			Auth::No => matches!(level, Level::No),
diff --git a/lib/src/doc/create.rs b/lib/src/doc/create.rs
index 77139264..62662027 100644
--- a/lib/src/doc/create.rs
+++ b/lib/src/doc/create.rs
@@ -20,6 +20,8 @@ impl<'a> Document<'a> {
 		self.exist(ctx, opt, txn, stm).await?;
 		// Merge record data
 		self.merge(ctx, opt, txn, stm).await?;
+		// Merge fields data
+		self.field(ctx, opt, txn, stm).await?;
 		// Check if allowed
 		self.allow(ctx, opt, txn, stm).await?;
 		// Store index data
diff --git a/lib/src/doc/field.rs b/lib/src/doc/field.rs
new file mode 100644
index 00000000..c02d7388
--- /dev/null
+++ b/lib/src/doc/field.rs
@@ -0,0 +1,124 @@
+use crate::ctx::Context;
+use crate::dbs::Options;
+use crate::dbs::Runtime;
+use crate::dbs::Statement;
+use crate::dbs::Transaction;
+use crate::doc::Document;
+use crate::err::Error;
+use crate::sql::kind::Kind;
+use crate::sql::permission::Permission;
+use crate::sql::value::Value;
+
+impl<'a> Document<'a> {
+	pub async fn field(
+		&mut self,
+		ctx: &Runtime,
+		opt: &Options,
+		txn: &Transaction,
+		_stm: &Statement,
+	) -> Result<(), Error> {
+		// Get the record id
+		let rid = self.id.as_ref().unwrap();
+		// Get all field statements
+		let fds = txn.clone().lock().await.all_fd(opt.ns(), opt.db(), &rid.tb).await?;
+		// Loop through all field statements
+		for fd in fds.iter() {
+			// Get the initial value
+			let old = self.initial.get(ctx, opt, txn, &fd.name).await?;
+			// Get the current value
+			let mut val = self.current.get(ctx, opt, txn, &fd.name).await?;
+			// Check for a VALUE clause
+			if let Some(expr) = &fd.value {
+				// Configure the context
+				let mut ctx = Context::new(ctx);
+				ctx.add_value("value".into(), val.clone());
+				ctx.add_value("after".into(), val.clone());
+				ctx.add_value("before".into(), old.clone());
+				let ctx = ctx.freeze();
+				// Process the VALUE clause
+				val = expr.compute(&ctx, opt, txn, Some(&self.current)).await?;
+			}
+			// Check for a TYPE clause
+			if let Some(kind) = &fd.kind {
+				val = match kind {
+					Kind::Any => val,
+					Kind::Bool => val.make_bool(),
+					Kind::Int => val.make_int(),
+					Kind::Float => val.make_float(),
+					Kind::Decimal => val.make_decimal(),
+					Kind::Number => val.make_number(),
+					Kind::String => val.make_strand(),
+					Kind::Datetime => val.make_datetime(),
+					Kind::Duration => val.make_duration(),
+					Kind::Array => match val {
+						Value::Array(_) => val,
+						_ => Value::None,
+					},
+					Kind::Object => match val {
+						Value::Object(_) => val,
+						_ => Value::None,
+					},
+					Kind::Record(t) => match val.is_type_record(t) {
+						true => val,
+						_ => Value::None,
+					},
+					Kind::Geometry(t) => match val.is_type_geometry(t) {
+						true => val,
+						_ => Value::None,
+					},
+				}
+			}
+			// Check for a ASSERT clause
+			if let Some(expr) = &fd.assert {
+				// Configure the context
+				let mut ctx = Context::new(ctx);
+				ctx.add_value("value".into(), val.clone());
+				ctx.add_value("after".into(), val.clone());
+				ctx.add_value("before".into(), old.clone());
+				let ctx = ctx.freeze();
+				// Process the ASSERT clause
+				if !expr.compute(&ctx, opt, txn, Some(&self.current)).await?.is_truthy() {
+					return Err(Error::FieldValue {
+						value: val.clone(),
+						field: fd.name.clone(),
+						check: expr.clone(),
+					});
+				}
+			}
+			// Check for a PERMISSIONS clause
+			if opt.perms && opt.auth.perms() {
+				let perms = if self.initial.is_none() {
+					&fd.permissions.create
+				} else if self.current.is_none() {
+					&fd.permissions.delete
+				} else {
+					&fd.permissions.update
+				};
+				match perms {
+					Permission::Full => (),
+					Permission::None => val = old,
+					Permission::Specific(e) => {
+						// Configure the context
+						let mut ctx = Context::new(ctx);
+						ctx.add_value("value".into(), val.clone());
+						ctx.add_value("after".into(), val.clone());
+						ctx.add_value("before".into(), old.clone());
+						let ctx = ctx.freeze();
+						// Process the PERMISSION clause
+						if !e.compute(&ctx, opt, txn, Some(&self.current)).await?.is_truthy() {
+							val = old
+						}
+					}
+				}
+			}
+			// Set the value of the field
+			match val {
+				Value::None => self.current.to_mut().del(ctx, opt, txn, &fd.name).await?,
+				Value::Void => self.current.to_mut().del(ctx, opt, txn, &fd.name).await?,
+				_ => self.current.to_mut().set(ctx, opt, txn, &fd.name, val).await?,
+			};
+		}
+		// Carry on
+		Ok(())
+	}
+}
diff --git a/lib/src/doc/mod.rs b/lib/src/doc/mod.rs
index 23a0023f..42ea168b 100644
--- a/lib/src/doc/mod.rs
+++ b/lib/src/doc/mod.rs
@@ -13,6 +13,7 @@ mod empty;
 mod erase;
 mod event;
 mod exist;
+mod field;
 mod grant;
 mod index;
 mod insert;
diff --git a/lib/src/doc/relate.rs b/lib/src/doc/relate.rs
index 1affcd9e..30c1eefc 100644
--- a/lib/src/doc/relate.rs
+++ b/lib/src/doc/relate.rs
@@ -20,6 +20,8 @@ impl<'a> Document<'a> {
 		self.allow(ctx, opt, txn, stm).await?;
 		// Merge record data
 		self.merge(ctx, opt, txn, stm).await?;
+		// Merge fields data
+		self.field(ctx, opt, txn, stm).await?;
 		// Check if allowed
 		self.allow(ctx, opt, txn, stm).await?;
 		// Store index data
diff --git a/lib/src/doc/update.rs b/lib/src/doc/update.rs
index 20299cd5..caabcb05 100644
--- a/lib/src/doc/update.rs
+++ b/lib/src/doc/update.rs
@@ -22,6 +22,8 @@ impl<'a> Document<'a> {
 		self.allow(ctx, opt, txn, stm).await?;
 		// Merge record data
 		self.merge(ctx, opt, txn, stm).await?;
+		// Merge fields data
+		self.field(ctx, opt, txn, stm).await?;
 		// Check if allowed
 		self.allow(ctx, opt, txn, stm).await?;
 		// Store index data
diff --git a/lib/src/err/mod.rs b/lib/src/err/mod.rs
index b7537777..eb67e5c6 100644
--- a/lib/src/err/mod.rs
+++ b/lib/src/err/mod.rs
@@ -1,3 +1,4 @@
+use crate::sql::idiom::Idiom;
 use crate::sql::thing::Thing;
 use crate::sql::value::Value;
 use msgpack::encode::Error as SerdeError;
@@ -173,6 +174,13 @@ pub enum Error {
 		thing: Thing,
 	},
 
+	#[error("Found '{value}' for field '{field}' but field must conform to: {check}")]
+	FieldValue {
+		value: Value,
+		field: Idiom,
+		check: Value,
+	},
+
 	#[error("Serde error: {0}")]
 	Serde(#[from] SerdeError),
 
diff --git a/lib/src/sql/value/value.rs b/lib/src/sql/value/value.rs
index 3b67cba6..f051ad5c 100644
--- a/lib/src/sql/value/value.rs
+++ b/lib/src/sql/value/value.rs
@@ -507,6 +507,40 @@ impl Value {
 		}
 	}
 
+	pub fn is_type_record(&self, types: &[Table]) -> bool {
+		match self {
+			Value::Thing(v) => types.iter().any(|t| t.name == v.tb),
+			_ => false,
+		}
+	}
+
+	pub fn is_type_geometry(&self, types: &[String]) -> bool {
+		match self {
+			Value::Geometry(Geometry::Point(_)) => {
+				types.iter().any(|t| &t[..] == "feature" || &t[..] == "point")
+			}
+			Value::Geometry(Geometry::Line(_)) => {
+				types.iter().any(|t| &t[..] == "feature" || &t[..] == "line")
+			}
+			Value::Geometry(Geometry::Polygon(_)) => {
+				types.iter().any(|t| &t[..] == "feature" || &t[..] == "polygon")
+			}
+			Value::Geometry(Geometry::MultiPoint(_)) => {
+				types.iter().any(|t| &t[..] == "feature" || &t[..] == "multipoint")
+			}
+			Value::Geometry(Geometry::MultiLine(_)) => {
+				types.iter().any(|t| &t[..] == "feature" || &t[..] == "multiline")
+			}
+			Value::Geometry(Geometry::MultiPolygon(_)) => {
+				types.iter().any(|t| &t[..] == "feature" || &t[..] == "multipolygon")
+			}
+			Value::Geometry(Geometry::Collection(_)) => {
+				types.iter().any(|t| &t[..] == "feature" || &t[..] == "collection")
+			}
+			_ => false,
+		}
+	}
+
 	// -----------------------------------
 	// Simple conversion of value
 	// -----------------------------------