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Syntax

SHOW INDEXES FROM table_name [ LIKE_expression ];

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Parameters

ParameterDescription
table_nameThe table from which indexes will be displayed.
LIKE_expressionFilters the output based on names by applying pattern matching. See details in LIKE pattern matching expressions.

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Example

We can create a table t3 and an index idx1 on t3. 
CREATE TABLE IF NOT EXISTS t3 (
    v1 int,
    v2 int,
    v3 int);

CREATE INDEX idx1 ON t3 (v1,v2);
Next, we can use the SHOW INDEXES command on t3 to see existing indexes. 
SHOW INDEXES FROM t3;

 Name | On |      Key       | Include | Distributed By
------+----+----------------+---------+----------------
 idx1 | t3 | v1 ASC, v2 ASC | v3      | v1, v2
(1 row)

CREATE INDEX