JSON_VALUE
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The JSON_VALUE function is used to extract content from JSON documents using a JSON path expression.
SELECT json_value(
'{"a":[1,2,3]}',
'$.a[1]'
)
FROM dual
create.select(jsonValue(
val(JSON.valueOf("{\"a\":[1,2,3]}")),
"$.a[1]"
)
.fetch();
The result would look like this:
+------------+ | json_value | +------------+ | 2 | +------------+
If the value does not matter, but you just want to check for a value's existence, use the JSON_EXISTS predicate.
Dialect support
This example using jOOQ:
jsonValue(val(json("[1,2]")), "$[*]")
Translates to the following dialect specific expressions:
-- DB2, MARIADB, ORACLE
json_value('[1,2]', '$[*]')
-- MYSQL, SQLITE
json_extract('[1,2]', '$[*]')
-- POSTGRES, YUGABYTEDB
jsonb_path_query_first(
CAST('[1,2]' AS jsonb),
cast('$[*]' as jsonpath)
)
-- SQLSERVER
(
SELECT c
FROM openjson('[1,2]', '$') WITH (c varchar(max) '$[*]')
)
-- ACCESS, ASE, AURORA_MYSQL, AURORA_POSTGRES, BIGQUERY, COCKROACHDB, DERBY, DUCKDB, EXASOL, FIREBIRD, H2, HANA, HSQLDB,
-- INFORMIX, MEMSQL, REDSHIFT, SNOWFLAKE, SQLDATAWAREHOUSE, SYBASE, TERADATA, TRINO, VERTICA
/* UNSUPPORTED */
(These are currently generated with jOOQ 3.19, see #10141), or translate your own on our website
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