I have a table that looks like

```
| id | day1 | day2 | day3 | day4 | day5 |
| 1  |  4   |  0   |  5   | 0    | 0    |
| 2  |  2   |  0   |  0   | 4    | 1    |

```

and I want to find to total number of zero entries for each id to give

```
| id | total_zeros |
| 1  | 3           |
| 2  | 2           |

```