CSVįormats variables with multiple values as a comma-separated string. Assume, I have a table that contains the value in an array something like this. If any invalid formatting option is specified, then glob is the default/fallback option.Īn alternative syntax (that might be deprecated in the future) is ]. Postgres 12 or later: with SQL/JSON path expression SELECT FROM tbl WHERE jdata->'array' ' (exists (.'attr'))' You can look for keys or values, only in the outer nesting level or recurse, abstract arrays away (unnest them) in lax mode or not (strict mode). How to query array in Postgres json column Ask Question Asked 1 year, 11 months ago Modified 1 year, 11 months ago Viewed 4k times 0 Thanks in advance. Since your JSON array seems to contain only numbers, the simple syntax works: SELECT FROM tbl WHERE collection > '3' - single quotes required If you omit the quotes, Postgres resolves the numeric literal to integer and doesn't find an operator for json > integer. Test the formatting options on the Grafana Play site. You can use the json / jsonb containment operator >. You can make that happen with advanced variable formatting options listed below. In some cases, you might want to have a comma-separated string without quotes: server01,server02. The formatting of the variable interpolation depends on the data source, but there are some situations where you might want to change the default formatting.įor example, the default for the MySql data source is to join multiple values as comma-separated with quotes: 'server01','server02'. Read the data source specificĭocumentation topic for details on value escaping during interpolation.įor advanced syntax to override data source default formatting, refer to Advanced variable format options. Interpolation, the variable value might be escaped in order to conform to the syntax of the query language and where it is used.įor example, a variable used in a regex expression in an InfluxDB or Prometheus query will be regex escaped. Deprecated old syntax, will be removed in a future release.īefore queries are sent to your data source the query is interpolated, meaning the variable is replaced with its current value. Support for working with JSON in PostgreSQL has become increasingly powerful since it was first introduced in version 9.2. ![]() Refer to Advanced variable format options for more detail on all the formatting types. $ This format gives you more control over how Grafana interpolates values.This syntax is easy to read, but it does not allow you to use a variable in the middle of a word.Įxample: ontend.$ Panel titles and metric queries can refer to variables using two different syntaxes: INSERT INTO test (data) VALUES ('') īased on the previous query, I defined the column data as json for this tutorial.Grafana Cloud Enterprise Open source Variable syntax For the sake of visibility, below is the query of the table schema I will use to show examples of how to query data from a JSON column. ![]() In this article, I’ll explain the different ways you can query data from a JSON column in PostgreSQL. This can bring some different notations in the way you fetch data from a JSON column. Luckily, PostgreSQL allows defining column types as json and jsonb, which are two JSON (JavaScript Object Notation) data types that allow storing unstructured data in a relational database. ![]() ![]() As a software engineer, it is common to store structured data in a relational database such as PostgreSQL, or unstructured data in a non-relational database such as Mongo DB.
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