> For the complete documentation index, see [llms.txt](https://boxlang.ortusbooks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://boxlang.ortusbooks.com/boxlang-language/reference/built-in-functions/query/queryaddcolumn.md).

# QueryAddColumn

Adds a column to a query and populates its rows with the contents of a one-dimensional array.

## Method Signature

```
QueryAddColumn(query=[query], columnName=[string], datatype=[any], array=[array])
```

### Arguments

| Argument     | Type     | Required | Description                                                                                                 | Default  |
| ------------ | -------- | -------- | ----------------------------------------------------------------------------------------------------------- | -------- |
| `query`      | `query`  | `true`   | The query object to which the column should be added.                                                       |          |
| `columnName` | `string` | `true`   | The name of the column to add.                                                                              |          |
| `datatype`   | `any`    | `false`  | The column data type of the new column or the array to populate the column with a generic type of anything. | `object` |
| `array`      | `array`  | `false`  |                                                                                                             | `[]`     |

## Examples

### Tag Example

```java
<!--- Make a query. ---> 
 <bx:set myQuery = queryNew( "" ) > 
  <!--- Create an array. ---> 
 <bx:set FastFoodArray = arrayNew( 1 ) > 
 <bx:set FastFoodArray[ 1 ] = "French Fries" > 
 <bx:set FastFoodArray[ 2 ] = "Hot Dogs" > 
 <bx:set FastFoodArray[ 3 ] = "Fried Clams" > 
 <bx:set FastFoodArray[ 4 ] = "Thick Shakes" > 
 <!--- Use the array to add a column to the query. ---> 
 <bx:set nColumnNumber = queryAddColumn( myQuery, "FastFood", "VarChar", FastFoodArray ) > 
 <bx:dump var="#myQuery#"/> 
```

### member syntax example

add a column to a query using member syntax

[Run Example](https://try.boxlang.io/?code=eJxLys%2FPLlawVSgsTS2q9Est11BQykzRKcksyUlV0gGy80pS01OLdMoSi5IzEouUFDStuZJAWvQSU1Kc83NKc%2FOAOhJLSzLyi0DqYep0FKJjQWrLizJLUl1Kcws0FMDaQGIAukUlgg%3D%3D)

```java
books = queryNew( "id,title", "integer,varchar" );
books.addColumn( "author", "varchar", [] );
writeDump( books );

```

### Additional Examples

[Run Example](https://try.boxlang.io/?code=eJwrLKpUsFUoLE0tqvRLLddQUEpMTNRJSkpSUtC05goECTumpATlA2UKgSphYsGpJc6pOTlgQR2wHiUgZahnqIRLCchIsBIjckw2ImyyEZrJzvk5pbl5MEXJyclARTmZxSUh%2BY5FRYmVQJ8a6xnqGIN14daXkpICMjwzryQ1PbUIwwgToBEmcCPKizJLUl1KcwvAuvWc%2FX1Cff18PINDQJIAVuJqfw%3D%3D)

```java
qry = queryNew( "aaa,bbb" );
QueryAddRow( qry );
QuerySetCell( qry, "aaa", "1.1" );
QuerySetCell( qry, "bbb", "1.2" );
QueryAddRow( qry );
QuerySetCell( qry, "aaa", "2.1" );
QuerySetCell( qry, "bbb", "2.2" );
QueryAddColumn( qry, "ccc", listToArray( "3.1,3.2" ) );
QueryAddColumn( qry, "ddd", "integer", listToArray( "4.1,4.2" ) );
writeDump( qry.COLUMNLIST );

```

## Related

* [QueryAddRow](/boxlang-language/reference/built-in-functions/query/queryaddrow.md)
* [QueryAppend](/boxlang-language/reference/built-in-functions/query/queryappend.md)
* [QueryClear](/boxlang-language/reference/built-in-functions/query/queryclear.md)
* [QueryColumnArray](/boxlang-language/reference/built-in-functions/query/querycolumnarray.md)
* [QueryColumnCount](/boxlang-language/reference/built-in-functions/query/querycolumncount.md)
* [QueryColumnData](/boxlang-language/reference/built-in-functions/query/querycolumndata.md)
* [QueryColumnExists](/boxlang-language/reference/built-in-functions/query/querycolumnexists.md)
* [QueryColumnList](/boxlang-language/reference/built-in-functions/query/querycolumnlist.md)
* [QueryCurrentRow](/boxlang-language/reference/built-in-functions/query/querycurrentrow.md)
* [QueryDeleteColumn](/boxlang-language/reference/built-in-functions/query/querydeletecolumn.md)
* [QueryDeleteRow](/boxlang-language/reference/built-in-functions/query/querydeleterow.md)
* [QueryEach](/boxlang-language/reference/built-in-functions/query/queryeach.md)
* [QueryEvery](/boxlang-language/reference/built-in-functions/query/queryevery.md)
* [QueryFilter](/boxlang-language/reference/built-in-functions/query/queryfilter.md)
* [QueryGetCell](/boxlang-language/reference/built-in-functions/query/querygetcell.md)
* [QueryGetResult](/boxlang-language/reference/built-in-functions/query/querygetresult.md)
* [QueryInsertAt](/boxlang-language/reference/built-in-functions/query/queryinsertat.md)
* [QueryKeyExists](/boxlang-language/reference/built-in-functions/query/querykeyexists.md)
* [QueryMap](/boxlang-language/reference/built-in-functions/query/querymap.md)
* [QueryNew](/boxlang-language/reference/built-in-functions/query/querynew.md)
* [QueryNone](/boxlang-language/reference/built-in-functions/query/querynone.md)
* [QueryPrepend](/boxlang-language/reference/built-in-functions/query/queryprepend.md)
* [QueryRecordCount](/boxlang-language/reference/built-in-functions/query/queryrecordcount.md)
* [QueryRecordCount](/boxlang-language/reference/built-in-functions/query/queryrecordcount.md)
* [QueryReduce](/boxlang-language/reference/built-in-functions/query/queryreduce.md)
* [QueryRegisterFunction](/boxlang-language/reference/built-in-functions/query/queryregisterfunction.md)
* [QueryReverse](/boxlang-language/reference/built-in-functions/query/queryreverse.md)
* [QueryRowData](/boxlang-language/reference/built-in-functions/query/queryrowdata.md)
* [QueryRowSwap](/boxlang-language/reference/built-in-functions/query/queryrowswap.md)
* [QuerySetCell](/boxlang-language/reference/built-in-functions/query/querysetcell.md)
* [QuerySetRow](/boxlang-language/reference/built-in-functions/query/querysetrow.md)
* [QuerySlice](/boxlang-language/reference/built-in-functions/query/queryslice.md)
* [QuerySome](/boxlang-language/reference/built-in-functions/query/querysome.md)
* [QuerySort](/boxlang-language/reference/built-in-functions/query/querysort.md)


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