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[SPARK-31569][SQL][DOCS] Add links to subsections in SQL Reference main page #28360

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26 changes: 20 additions & 6 deletions docs/sql-ref.md
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---
layout: global
title: Reference
displayTitle: Reference
title: SQL Reference
displayTitle: SQL Reference
license: |
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
Expand All @@ -19,7 +19,21 @@ license: |
limitations under the License.
---

Spark SQL is Apache Spark's module for working with structured data.
This guide is a reference for Structured Query Language (SQL) for Apache
Spark. This document describes the SQL constructs supported by Spark in detail
along with usage examples when applicable.
Spark SQL is Apache Spark's module for working with structured data. This guide is a reference for Structured Query Language (SQL) and includes syntax, semantics, keywords, and examples for common SQL usage. It contains information for the following topics:

* [Data Types](sql-ref-datatypes.html)
* [Identifiers](sql-ref-identifier.html)
* [Literals](sql-ref-literals.html)
* [Null Semanitics](sql-ref-null-semantics.html)
* [ANSI Compliance](sql-ref-ansi-compliance.html)
* [SQL Syntax](sql-ref-syntax.html)
* [DDL Statements](sql-ref-syntax-ddl.html)
* [DML Statements](sql-ref-syntax-ddl.html)
* [Data Retrieval Statements](sql-ref-syntax-qry.html)
* [Auxiliary Statements](sql-ref-syntax-aux.html)
* [Functions](sql-ref-functions.html)
* [Built-in Functions](sql-ref-functions-builtin.html)
* [Scalar User-Defined Functions (UDFs)](sql-ref-functions-udf-scalar.html)
* [User-Defined Aggregate Functions (UDAFs)](sql-ref-functions-udf-aggregate.html)
* [Integration with Hive UDFs/UDAFs/UDTFs](sql-ref-functions-udf-hive.html)
* [Datetime Pattern](sql-ref-datetime-pattern.html)