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>Chapter 4. SQL Syntax</H1
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><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>4.1. <A
HREF="sql-syntax-lexical.html"
>Lexical Structure</A
></DT
><DD
><DL
><DT
>4.1.1. <A
HREF="sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS"
>Identifiers and Key Words</A
></DT
><DT
>4.1.2. <A
HREF="sql-syntax-lexical.html#SQL-SYNTAX-CONSTANTS"
>Constants</A
></DT
><DT
>4.1.3. <A
HREF="sql-syntax-lexical.html#SQL-SYNTAX-OPERATORS"
>Operators</A
></DT
><DT
>4.1.4. <A
HREF="sql-syntax-lexical.html#SQL-SYNTAX-SPECIAL-CHARS"
>Special Characters</A
></DT
><DT
>4.1.5. <A
HREF="sql-syntax-lexical.html#SQL-SYNTAX-COMMENTS"
>Comments</A
></DT
><DT
>4.1.6. <A
HREF="sql-syntax-lexical.html#SQL-PRECEDENCE"
>Operator Precedence</A
></DT
></DL
></DD
><DT
>4.2. <A
HREF="sql-expressions.html"
>Value Expressions</A
></DT
><DD
><DL
><DT
>4.2.1. <A
HREF="sql-expressions.html#SQL-EXPRESSIONS-COLUMN-REFS"
>Column References</A
></DT
><DT
>4.2.2. <A
HREF="sql-expressions.html#SQL-EXPRESSIONS-PARAMETERS-POSITIONAL"
>Positional Parameters</A
></DT
><DT
>4.2.3. <A
HREF="sql-expressions.html#SQL-EXPRESSIONS-SUBSCRIPTS"
>Subscripts</A
></DT
><DT
>4.2.4. <A
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>Field Selection</A
></DT
><DT
>4.2.5. <A
HREF="sql-expressions.html#SQL-EXPRESSIONS-OPERATOR-CALLS"
>Operator Invocations</A
></DT
><DT
>4.2.6. <A
HREF="sql-expressions.html#SQL-EXPRESSIONS-FUNCTION-CALLS"
>Function Calls</A
></DT
><DT
>4.2.7. <A
HREF="sql-expressions.html#SYNTAX-AGGREGATES"
>Aggregate Expressions</A
></DT
><DT
>4.2.8. <A
HREF="sql-expressions.html#SYNTAX-WINDOW-FUNCTIONS"
>Window Function Calls</A
></DT
><DT
>4.2.9. <A
HREF="sql-expressions.html#SQL-SYNTAX-TYPE-CASTS"
>Type Casts</A
></DT
><DT
>4.2.10. <A
HREF="sql-expressions.html#SQL-SYNTAX-COLLATE-EXPRS"
>Collation Expressions</A
></DT
><DT
>4.2.11. <A
HREF="sql-expressions.html#SQL-SYNTAX-SCALAR-SUBQUERIES"
>Scalar Subqueries</A
></DT
><DT
>4.2.12. <A
HREF="sql-expressions.html#SQL-SYNTAX-ARRAY-CONSTRUCTORS"
>Array Constructors</A
></DT
><DT
>4.2.13. <A
HREF="sql-expressions.html#SQL-SYNTAX-ROW-CONSTRUCTORS"
>Row Constructors</A
></DT
><DT
>4.2.14. <A
HREF="sql-expressions.html#SYNTAX-EXPRESS-EVAL"
>Expression Evaluation Rules</A
></DT
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><DT
>4.3. <A
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>Calling Functions</A
></DT
><DD
><DL
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>4.3.1. <A
HREF="sql-syntax-calling-funcs.html#SQL-SYNTAX-CALLING-FUNCS-POSITIONAL"
>Using Positional Notation</A
></DT
><DT
>4.3.2. <A
HREF="sql-syntax-calling-funcs.html#SQL-SYNTAX-CALLING-FUNCS-NAMED"
>Using Named Notation</A
></DT
><DT
>4.3.3. <A
HREF="sql-syntax-calling-funcs.html#SQL-SYNTAX-CALLING-FUNCS-MIXED"
>Using Mixed Notation</A
></DT
></DL
></DD
></DL
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><P
>  This chapter describes the syntax of SQL.  It forms the foundation
  for understanding the following chapters which will go into detail
  about how SQL commands are applied to define and modify data.
 </P
><P
>  We also advise users who are already familiar with SQL to read this
  chapter carefully because it contains several rules and concepts that
  are implemented inconsistently among SQL databases or that are
  specific to <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>.
 </P
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