opensearch-docs-cn/_search-plugins/sql/ppl/syntax.md

layout	title	parent	grand_parent	nav_order
default	Syntax	PPL - Piped Processing Language	SQL and PPL	1

PPL syntax

Every PPL query starts with the search command. It specifies the index to search and retrieve documents from. Subsequent commands can follow in any order.

Currently, PPL supports only one search command, which can be omitted to simplify the query. { : .note}

Syntax

search source=<index> [boolean-expression]
source=<index> [boolean-expression]

Field	Description	Required
search	Specifies search keywords.	Yes
index	Specifies which index to query from.	No
bool-expression	Specifies an expression that evaluates to a Boolean value.	No

Examples

Example 1: Search through accounts index

In the following example, the search command refers to an accounts index as the source and uses fields and where commands for the conditions:

search source=accounts
| where age > 18
| fields firstname, lastname

In the following examples, angle brackets < > enclose required arguments and square brackets [ ] enclose optional arguments. {: .note }

Example 2: Get all documents

To get all documents from the accounts index, specify it as the source:

search source=accounts;

account_number	firstname	address	balance	gender	city	employer	state	age	email	lastname
1	Amber	880 Holmes Lane	39225	M	Brogan	Pyrami	IL	32	amberduke@pyrami.com	Duke
6	Hattie	671 Bristol Street	5686	M	Dante	Netagy	TN	36	hattiebond@netagy.com	Bond
13	Nanette	789 Madison Street	32838	F	Nogal	Quility	VA	28	null	Bates
18	Dale	467 Hutchinson Court	4180	M	Orick	null	MD	33	daleadams@boink.com	Adams

Example 3: Get documents that match a condition

To get all documents from the accounts index that either have account_number equal to 1 or have gender as F, use the following query:

search source=accounts account_number=1 or gender=\"F\";

account_number	firstname	address	balance	gender	city	employer	state	age	email	lastname
1	Amber	880 Holmes Lane	39225	M	Brogan	Pyrami	IL	32	amberduke@pyrami.com	Duke
13	Nanette	789 Madison Street	32838	F	Nogal	Quility	VA	28	null	Bates