Data Import
CSV
Read all files with a name ending in `.csv` in the folder `dir`:  
```sql
SELECT *
FROM 'dir/*.csv';
```  
Read all files with a name ending in `.csv`, two directories deep:  
```sql
SELECT *
FROM '*/*/*.csv';
```  
Read all files with a name ending in `.csv`, at any depth in the folder `dir`:  
```sql
SELECT *
FROM 'dir/**/*.csv';
```  
Read the CSV files `flights1.csv` and `flights2.csv`:  
```sql
SELECT *
FROM read_csv(['flights1.csv', 'flights2.csv']);
```  
Read the CSV files `flights1.csv` and `flights2.csv`, unifying schemas by name and outputting a `filename` column:  
```sql
SELECT *
FROM read_csv(['flights1.csv', 'flights2.csv'], union_by_name = true, filename = true);
```