add Flux intro
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weight: 209
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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Flux provides `if`, `then`, and `else` conditional expressions that allow for powerful and flexible Flux queries.
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##### Conditional expression syntax
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weight: 209
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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Use the Flux `exists` operator to check if an object contains a key or if that
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key's value is `null`.
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weight: 203
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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With Flux, you can group data by any column in your queried data set.
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"Grouping" partitions data into tables in which each row shares a common value for specified columns.
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This guide walks through grouping data in Flux and provides examples of how data is shaped in the process.
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weight: 208
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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Histograms provide valuable insight into the distribution of your data.
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This guide walks through using Flux's `histogram()` function to transform your data into a **cumulative histogram**.
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weight: 205
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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The [`join()` function](/v2.0/reference/flux/stdlib/built-in/transformations/join) merges two or more
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input streams, whose values are equal on a set of common columns, into a single output stream.
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Flux allows you to join on any columns common between two data streams and opens the door
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weight: 209
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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Every point stored in InfluxDB has an associated timestamp.
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Use Flux to process and manipulate timestamps to suit your needs.
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weight: 209
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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[Flux](/v2.0/reference/flux), InfluxData's data scripting and query language,
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supports mathematic expressions in data transformations.
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This article describes how to use [Flux arithmetic operators](/v2.0/reference/flux/language/operators/#arithmetic-operators)
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weight: 210
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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Regular expressions (regexes) are incredibly powerful when matching patterns in large collections of data.
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With Flux, regular expressions are primarily used for evaluation logic in predicate functions for things
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such as filtering rows, dropping and keeping columns, state detection, etc.
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weight: 206
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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The [`sort()`function](/v2.0/reference/flux/stdlib/built-in/transformations/sort)
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orders the records within each table.
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The following example orders system uptime first by region, then host, then value.
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weight: 207
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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The [Flux](/v2.0/reference/flux) `sql` package provides functions for working with SQL data sources.
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[`sql.from()`](/v2.0/reference/flux/stdlib/sql/from/) lets you query SQL data sources
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like [PostgreSQL](https://www.postgresql.org/) and [MySQL](https://www.mysql.com/)
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v2.0/tags: [flux, aggregates]
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---
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If you're just getting started with Flux queries, check out the following:
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- [Get started with Flux](/v2.0/query-data/get-started/) for a conceptual overview of Flux and parts of a Flux query.
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- [Execute queries](/v2.0/query-data/execute-queries/) to discover a variety of ways to run your queries.
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A common operation performed with time series data is grouping data into windows of time,
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or "windowing" data, then aggregating windowed values into a new value.
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This guide walks through windowing and aggregating data with Flux and demonstrates
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---
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title: monitor.check() function
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description: >
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The `monitor.check()` function function checks input data and assigns a level
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The `monitor.check()` function checks input data and assigns a level
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(`ok`, `info`, `warn`, or `crit`) to each row based on predicate functions.
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aliases:
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- /v2.0/reference/flux/functions/monitor/check/
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weight: 202
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---
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The `monitor.check()` function function checks input data and assigns a level
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The `monitor.check()` function checks input data and assigns a level
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(`ok`, `info`, `warn`, or `crit`) to each row based on predicate functions.
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_**Function type:** Transformation_
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