To answer your question, you would need to write a SQL query. Here is a step-by-step guide on how to do it:

1. Start by writing the initial part of the query which is to select the count of the electricity readings. This is done using the `COUNT` function in SQL.

```sql
SELECT COUNT(*)
```

2. Next, you need to specify the table from which you are selecting the count. This is done using the `FROM` keyword followed by the name of the table. In this case, the table name is `electricity_reading`.

```sql
SELECT COUNT(*)
FROM electricity_reading
```

3. Then, you need to specify the condition for which the count should be selected. This is done using the `WHERE` keyword followed by the condition. In this case, the condition is that the `total_units` per day should be greater than 500.

```sql
SELECT COUNT(*)
FROM electricity_reading
WHERE total_units 500
```

4. Finally, you need to give an alias to the count. This is done using the `AS` keyword followed by the alias name. In this case, the alias name is `count_total_units_500`.

```sql
SELECT COUNT(*) AS count_total_units_500
FROM electricity_reading
WHERE total_units 500
```

This is the final query. When you run this query, it will display the number of electricity readings where the total units per day is greater than 500. The count will be displayed with the alias name `count_total_units_500`.

Question

To answer your question, you would need to write a SQL query. Here is a step-by-step guide on how to do it:

1. Start by writing the initial part of the query which is to select the count of the electricity readings. This is done using the `COUNT` function in SQL.

```sql
SELECT COUNT(*)
```

2. Next, you need to specify the table from which you are selecting the count. This is done using the `FROM` keyword followed by the name of the table. In this case, the table name is `electricity_reading`.

```sql
SELECT COUNT(*)
FROM electricity_reading
```

3. Then, you need to specify the condition for which the count should be selected. This is done using the `WHERE` keyword followed by the condition. In this case, the condition is that the `total_units` per day should be greater than 500.

```sql
SELECT COUNT(*)
FROM electricity_reading
WHERE total_units > 500
```

4. Finally, you need to give an alias to the count. This is done using the `AS` keyword followed by the alias name. In this case, the alias name is `count_total_units_500`.

```sql
SELECT COUNT(*) AS count_total_units_500
FROM electricity_reading
WHERE total_units > 500
```

This is the final query. When you run this query, it will display the number of electricity readings where the total units per day is greater than 500. The count will be displayed with the alias name `count_total_units_500`.

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