From ff8f58a8613417a818cf09efda32374276d1c82c Mon Sep 17 00:00:00 2001
From: Chris Tsang <chris.2y3@outlook.com>
Date: Wed, 27 Nov 2024 10:03:22 +0000
Subject: [PATCH] Add example for SET NULL

---
 src/query/update.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/query/update.rs b/src/query/update.rs
index b267e813f..a514127b6 100644
--- a/src/query/update.rs
+++ b/src/query/update.rs
@@ -132,6 +132,24 @@ impl UpdateStatement {
     ///     query.to_string(SqliteQueryBuilder),
     ///     r#"UPDATE "glyph" SET "aspect" = 60 * 24 * 24, "image" = '24B0E11951B03B07F8300FD003983F03F0780060'"#
     /// );
+    ///
+    /// let query = Query::update()
+    ///     .table(Glyph::Table)
+    ///     .value(Glyph::Aspect, Expr::value(Value::Int(None)))
+    ///     .to_owned();
+    ///
+    /// assert_eq!(
+    ///     query.to_string(MysqlQueryBuilder),
+    ///     r#"UPDATE `glyph` SET `aspect` = NULL"#
+    /// );
+    /// assert_eq!(
+    ///     query.to_string(PostgresQueryBuilder),
+    ///     r#"UPDATE "glyph" SET "aspect" = NULL"#
+    /// );
+    /// assert_eq!(
+    ///     query.to_string(SqliteQueryBuilder),
+    ///     r#"UPDATE "glyph" SET "aspect" = NULL"#
+    /// );
     /// ```
     pub fn value<C, T>(&mut self, col: C, value: T) -> &mut Self
     where