Feature: Populate page about "SQL"

Author: amotl

docs/feature/sql/index.md

@@ -2,20 +2,74 @@
 
 # SQL
 
-:::{todo} Implement.
+
+:::::{grid}
+:padding: 0
+
+::::{grid-item}
+:class: rubric-slimmer
+:columns: 9
+
+:::{rubric} Overview
 :::
+CrateDB's features are available using plain SQL, and it is wire-protocol
+compatible to PostgreSQL.
 
+CrateDB integrates well with commodity systems using standard database
+access interfaces like ODBC or JDBC, and it provides a proprietary HTTP
+interface on top.
 
-CrateDB is wire-protocol compatible to PostgreSQL, and you can use all of its
-features using plain SQL.
-Other than integrating well with commodity systems using standard database
-access interfaces like ODBC or JDBC, it provides a proprietary HTTP interface
-on top.
+:::{rubric} About
+:::
+Interfacing with your data in standard SQL syntax unlocks
+manifold integration capabilities instead of resorting to specialized query
+languages or DSLs like Query DSL (Elasticsearch), the MongoDB Query Language,
+Flux (InfluxDB), or PromQL (Prometheus).
 
+:::{rubric} Details
+:::
 You have a variety of options to connect to CrateDB, and to integrate it with
 off-the-shelve, 3rd-party, open-source, and proprietary applications.
+::::
+
+
+::::{grid-item}
+:class: rubric-slim
+:columns: 3
+
+:::{rubric} Reference Manual
+:::
+- {ref}`crate-reference:sql`
+
+:::{rubric} Related
+:::
+- {ref}`connect`
+- {ref}`query`
+
+:::{rubric} Product
+:::
+- [Relational Database]
+- [Multi-model Database]
+- [JSON Database]
+- [Dynamic Database Schemas]
+- [Nested Data Structure]
+
+{tags-primary}`Query Language`
+{tags-primary}`Standard Interface` \
+{tags-secondary}`SQL`
+{tags-secondary}`ODBC`
+{tags-secondary}`JDBC`
+::::
+
+:::::
+
+
+
+## Synopsis
+
+:::{todo} One or max. two DQL SQL queries using many features at once?
+:::
 
-See {ref}`connect`.
 
 
 :::{seealso}
@@ -26,9 +80,18 @@ See {ref}`connect`.
 [](#timeseries) •
 [](#machine-learning)
 
-**Product:**
-[Relational Database]
 :::
 
 
+<!-- shared -->
+[Dynamic Database Schemas]: https://cratedb.com/product/features/dynamic-schemas
+[JSON Database]: https://cratedb.com/solutions/json-database
+[Multi-model Database]: https://cratedb.com/solutions/multi-model-database
+[Nested Data Structure]: https://cratedb.com/product/features/nested-data-structure
 [Relational Database]: https://cratedb.com/solutions/relational-database
+
+
+```{include} /_include/styles.html
+```
+
+