---
id: sql-to-api
title: 'Converting SQL to JavaScript API'
description: Implementing common SQL patterns in the JavaScript API
---

import Tabs from '@theme/Tabs'
import TabItem from '@theme/TabItem'

<!-- @TODO: this one is a very daunting read on first attempt. Need to check what is the purpose of it? -->

Select a set of columns from a single table with where, order by, and limit clauses.

```sql
select first_name, last_name, team_id, age from players
where age between 20 and 24 and team_id <> 'STL'
order by last_name, first_name desc
limit 20
```

```js
const { data, error } = await supabase
  .from('players')
  .select('first_name,last_name,team_id,age')
  .gte('age', 20)
  .lte('age', 24)
  .not('team_id', 'eq', 'STL')
  .order('last_name', { ascending: true }) // or just .order('last_name')
  .order('first_name', { ascending: false })
  .limit(20)
```

Select all columns from a single table with a complex where clause: OR AND OR

```sql
select * from players
where ((team_id = 'CHN' or team_id is null) and (age > 35 or age is null))
```

```js
const { data, error } = await supabase
  .from('players')
  .select() // or .select('*')
  .or('team_id.eq.CHN,team_id.is.null')
  .or('age.gt.35,age.is.null') // additional filters imply "AND"
  .not('team_id', 'eq', 'STL')
```

Select all columns from a single table with a complex where clause: AND OR AND

```sql
select * from players
where ((team_id = 'CHN' and age > 35) or (team_id <> 'CHN' and age is not null))
```

```js
const { data, error } = await supabase
  .from('players')
  .select() // or .select('*')
  .or('and(team_id.eq.CHN,age.gt.35),and(team_id.neq.CHN,.not.age.is.null)')
```

Get a count of rows, but don't return any data.

```sql
select count(*) from players
where team_id = 'NYM'
```

```js
const { data, error } = await supabase
  .from('players')
  .select('*', { count: 'exact', head: true }) // exact, planned, or executed
  .eq('team_id', 'NYM')
```

## Resources

- [Supabase Account - Free Tier OK](https://supabase.com)
- [Postgrest Operators](https://postgrest.org/en/stable/api.html#operators)
- [Supabase API: JavaScript select](/docs/reference/javascript/select)
- [Supabase API: JavaScript modifiers](/docs/reference/javascript/using-modifiers)
- [Supabase API: JavaScript filters](/docs/reference/javascript/using-filters)