Primary keys as a separate section

docs/README.md

@@ -8,15 +8,17 @@
 
 [Writing](writing.md) - How to write data to a database.
 
-[Result](result.md) - How sqlgen handles errors.
+[sqlgen::Result](result.md) - How sqlgen handles errors.
 
-[Timestamp](timestamp.md) - How timestamps work in sqlgen.
+[sqlgen::PrimaryKey](primary_key.md) - How to define primary keys in sqlgen.
 
-[Varchar](varchar.md) - How varchars work in sqlgen.
+[sqlgen::Timestamp](timestamp.md) - How timestamps work in sqlgen.
 
-[Flatten](flatten.md) - How to "inherit" fields from other structs.
+[sqlgen::Varchar](varchar.md) - How varchars work in sqlgen.
 
-[Literal](literal.md) - How to define fields that only allow for a fixed set of values.
+[sqlgen::Flatten](flatten.md) - How to "inherit" fields from other structs.
+
+[sqlgen::Literal](literal.md) - How to define fields that only allow for a fixed set of values.
 
 ## Supported databases
 

docs/defining_tables.md

@@ -78,42 +78,6 @@ CREATE TABLE IF NOT EXISTS "my_schema"."People"("first_name" TEXT NOT NULL,
                                                 "age"        INTEGER NOT NULL);
 ```
 
-## Primary keys
-
-Of course, you would also like to set primary keys on your
-tables. This is possible as well:
-
-```cpp
-struct People {
-    rfl::PrimaryKey<std::string> first_name;
-    std::string last_name;
-    uint age;
-};
-```
-
-Now, the generated SQL code will look something like this:
-
-```sql
-CREATE TABLE IF NOT EXISTS "People"("first_name" TEXT NOT NULL, 
-                                    "last_name"  TEXT NOT NULL, 
-                                    "age"        INTEGER NOT NULL,
-                                    PRIMARY_KEY("first_name"));
-```
-
-`rfl::PrimaryKey<...>` is a simple wrapper. You can simply assign to it as follows:
-
-```cpp
-const auto person = People{.first_name = "Homer", ...};
-```
-
-And you can retrieve the underlying value using any of the following:
-
-```cpp
-person.first_name();
-person.first_name.get();
-person.first_name.value();
-```
-
 ## Nullable types
 
 As we have seen, all columns are non-nullable by default. But what if we do want

docs/primary_key.md

@@ -0,0 +1,36 @@
+# `sqlgen::PrimaryKey` 
+
+Sometimes you would like to set primary keys on your
+tables. This is possible as well:
+
+```cpp
+struct People {
+    rfl::PrimaryKey<std::string> first_name;
+    std::string last_name;
+    uint age;
+};
+```
+
+Now, the generated SQL code will look something like this:
+
+```sql
+CREATE TABLE IF NOT EXISTS "People"("first_name" TEXT NOT NULL, 
+                                    "last_name"  TEXT NOT NULL, 
+                                    "age"        INTEGER NOT NULL,
+                                    PRIMARY_KEY("first_name"));
+```
+
+`rfl::PrimaryKey<...>` is a simple wrapper. You can simply assign to it as follows:
+
+```cpp
+const auto person = People{.first_name = "Homer", ...};
+```
+
+And you can retrieve the underlying value using any of the following:
+
+```cpp
+person.first_name();
+person.first_name.get();
+person.first_name.value();
+```
+