Summary: Postgres functions index for Neon, linking to individual guides for aggregate (array_agg, avg, count, max, sum), array, date/time, JSON and JSONB, math, string, and window functions. Use this page as the entry point to find the right built-in function guide rather than searching individual function pages.

Get started with commonly-used Postgres functions with Neon's function guides. For other functions that Postgres supports, visit the official Postgres Functions and Operators documentation.

• array_agg(): Aggregate elements into an array
• avg(): Calculate the average of a set of values
• count(): Count rows or non-null values in a result set
• max(): Find the maximum value in a set of values
• sum(): Calculate the sum of a set of values

• array_length(): Determine the length of an array

• age(): Calculate the difference between timestamps or between a timestamp and the current date/time
• current_timestamp: Get the current date and time
• date_trunc(): Truncate date/time values to a specified precision
• extract(): Extract date and time components from timestamps and intervals
• now(): Get the current date and time

• array_to_json(): Convert an SQL array to a JSON array
• json(): Transform JSON data into relational views
• json_agg(): Aggregate values into a JSON array
• json_array_elements(): Expand a JSON array into a set of rows
• jsonb_array_elements(): Expand a JSONB array into a set of rows
• json_build_object(): Build a JSON object out of a variadic argument list
• json_each(): Expand JSON into a record per key-value pair
• json_exists(): Check for Values in JSON Data Using SQL/JSON Path Expressions
• json_extract_path(): Extract a JSON sub-object at the specified path
• json_extract_path_text(): Extract a JSON sub-object at the specified path as text
• json_object(): Create a JSON object from key-value pairs
• json_populate_record(): Cast a JSON object to a record
• json_query(): Extract and Transform JSON Values with SQL/JSON Path Expressions
• json_scalar(): Convert Text and Binary Data to JSON Values
• json_serialize(): Convert JSON Values to Text or Binary Format
• json_table(): Transform JSON data into relational views
• json_to_record(): Convert a JSON object to a record
• json_value(): Extract and Convert JSON Scalar Values
• jsonb_each(): Expand JSONB into a record per key-value pair
• jsonb_extract_path(): Extract a JSONB sub-object at the specified path
• jsonb_extract_path_text(): Extract a JSONB sub-object at the specified path as text
• jsonb_object(): Create a JSONB object from key-value pairs
• jsonb_populate_record(): Cast a JSONB object to a record
• jsonb_to_record(): Convert a JSONB object to a record

• abs(): Calculate the absolute value of a number
• random(): Generate a random number between 0 and 1
• round(): Round numbers to a specified precision

• concat(): Concatenate strings
• lower(): Convert a string to lowercase
• substring(): Extract a substring from a string
• regexp_match(): Extract substrings matching a regular expression pattern
• regexp_replace(): Replace substrings matching a regular expression pattern
• trim(): Remove leading and trailing characters from a string

• dense_rank(): Return the rank of the current row without gaps
• lag(): Access values from previous rows in a result set
• lead(): Access values from subsequent rows in a result set
• rank(): Assign ranks to rows within a result set

• Data types
• Indexes
• Optimize queries
• Query reference
• Postgres RLS
• Version support
• Upgrade
• Compatibility

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