Clarify UPDATE statement support for JDBC connectors

docs/src/main/sphinx/connector/ignite.md

@@ -187,6 +187,9 @@ statements, the connector supports the following features:
 - {doc}`/sql/drop-table`
 - {doc}`/sql/alter-table`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} alter-table-limitation.fragment
 ```
 

docs/src/main/sphinx/connector/mariadb.md

@@ -293,6 +293,9 @@ statements, the connector supports the following features:
 - {doc}`/sql/create-schema`
 - {doc}`/sql/drop-schema`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} sql-delete-limitation.fragment
 ```
 

docs/src/main/sphinx/connector/mysql.md

@@ -336,6 +336,9 @@ the following statements:
 - {doc}`/sql/create-schema`
 - {doc}`/sql/drop-schema`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} sql-delete-limitation.fragment
 ```
 

docs/src/main/sphinx/connector/oracle.md

@@ -422,6 +422,9 @@ supports the following statements:
 - {doc}`/sql/alter-table`
 - {doc}`/sql/comment`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} sql-delete-limitation.fragment
 ```
 

docs/src/main/sphinx/connector/postgresql.md

@@ -352,6 +352,9 @@ statements, the connector supports the following features:
 - {doc}`/sql/truncate`
 - {ref}`sql-schema-table-management`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} sql-delete-limitation.fragment
 ```
 

docs/src/main/sphinx/connector/redshift.md

@@ -150,6 +150,9 @@ statements, the connector supports the following features:
 - {doc}`/sql/truncate`
 - {ref}`sql-schema-table-management`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} sql-delete-limitation.fragment
 ```
 

docs/src/main/sphinx/connector/singlestore.md

@@ -335,6 +335,9 @@ statements, the connector supports the following features:
 - {doc}`/sql/create-schema`
 - {doc}`/sql/drop-schema`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} sql-delete-limitation.fragment
 ```
 

docs/src/main/sphinx/connector/sql-update-limitation.fragment

@@ -0,0 +1,33 @@
+### UPDATE
+
+Only `UPDATE` statements with constant assignments and predicates are
+supported. For example, the following statement is supported because the values
+assigned are constants:
+
+```sql
+UPDATE table SET col1 = 1 WHERE col3 = 1
+```
+
+Arithmetic expressions, function calls, and other non-constant `UPDATE`
+statements are not supported. For example, the following statement is not
+supported because arithmetic expressions cannot be used with the `SET`
+command:
+
+```sql
+UPDATE table SET col1 = col2 + 2 WHERE col3 = 1
+```
+
+The `=`, `!=`, `>`, `<`, `>=`, `<=`, `IN`, `NOT IN` operators are supported in
+predicates. The following statement is not supported because the `AND` operator
+cannot be used in predicates:
+
+```sql
+UPDATE table SET col1 = 1 WHERE col3 = 1 AND col2 = 3
+```
+
+All column values of a table row cannot be updated simultaneously. For a three
+column table, the following statement is not supported:
+
+```sql
+UPDATE table SET col1 = 1, col2 = 2, col3 = 3 WHERE col3 = 1
+```

docs/src/main/sphinx/connector/sqlserver.md

@@ -339,6 +339,9 @@ supports the following features:
 - {doc}`/sql/truncate`
 - {ref}`sql-schema-table-management`
 
+```{include} sql-update-limitation.fragment
+```
+
 ```{include} sql-delete-limitation.fragment
 ```