# Conditional Functions

## CASE

`CASE WHEN <condition1> THEN <return1> [...] [ELSE <else>] END`

**Description**

Find values that match \<condition>  and return the corresponding value.  \<condition> must be a boolean expression (ex: age>20)

**Example**

```
CASE WHEN age < 20 THEN "teenager"
```

```
           WHEN age < 60 THEN "adult"
```

```
           ELSE "elder adult"
```

```
END
```

## IF

`IF(condition, true_result, else_result)`

**Description**

Check whether a value meets a condition and assign it to different values. If TRUE, it returns true\_value. Otherwise, it returns else\_value.

**Example**

```
IF(age > 20, "adult", "nonadult")
```

```
IF(close_price > open_price, "higher", "lower")
```

## IFNULL

`IFNULL(value, null_replacement)`

**Description**

Check whether a value is NULL. If the value is not null, it returns the original value. Otherwise, it returns null\_replacement.

**Example**

```
IFNULL(NULL, -1)
```

Result: -1

```
IFNULL(profit, 0)
```

## NULLIF

`NULLIF(value1, value2)`

**Description**

Check whether value1 is equal to value2. Returns NULL if TRUE, otherwise returns the value1.

**Example**

```
NULLIF(0, 0)
```

Result: NULL

```
NULLIF(10, 0)
```

Result: 10


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