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‎README.md

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**[⬆ Back to Top](#sql-coding-challenges-for-beginners)**
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## 31. Growing Plant
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Each day a plant is growing by `up_speed` meters. Each night that plant's height declines by `down_speed` meters due to the lack of sun heat. Initially, the plant is `0` meters tall. We plant the seed at the beginning of a day. We want to know the number of days that it will take for the plant to reach or pass a desired height (including the last day in the total count). For example,
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- For `up_speed = 100`, `down_speed = 10` and `desired_height = 910`, the output should be `10` days.
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- For `up_speed = 10`, `down_speed = 9` and `desired_height = 4`, the output should be `1` day, because the plant already reaches the desired height on the first day.
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```
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growing_plant output
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------------- ------
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id id
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down_speed num_days
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up_speed
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desired_height
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```
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<details><summary>Solution</summary>
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```sql
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SELECT
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id,
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CASE
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WHEN up_speed >= desired_height THEN 1
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ELSE CEIL((desired_height - up_speed)::decimal / (up_speed - down_speed))::int + 1
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END
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AS num_days
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FROM growing_plant;
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```
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</details>
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---
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**[⬆ Back to Top](#sql-coding-challenges-for-beginners)**

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