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Can you break this down for me please?
Thank you
Transcribed Image Text:**Table Name: table1**
| cod1 | val1 | val2 |
|------|------|------|
| 10 | 10 | 8 |
| 12 | 10 | 6 |
| 21 | 11 | 15 |
| 33 | 10 | 2 |
| 41 | 9 | 11 |
| 8 | 10 | 6 |
| 14 | 9 | 5 |
| 11 | 11 | 4 |
This table includes three columns labeled `cod1`, `val1`, and `val2`. Each row represents a data set with values corresponding to these labels. The table provides numerical data that can be used for analysis, comparison, or educational purposes.
Transcribed Image Text:**Query and Explanation**
The query below is designed to extract specific data from a database:
```sql
SELECT MIN(cod1)
FROM (SELECT val1, MAX(val2) max_val2
FROM table1
GROUP BY val1) max_table
JOIN table1
ON max_table.val1 = table1.val1
WHERE val2 = max_val2;
```
**Explanation:**
1. **Inner Query:**
- The inner query selects `val1` and the maximum value of `val2` for each group of `val1` from `table1`.
- Resulting data is aliased as `max_table`.
2. **Join Operation:**
- The result of the inner query (`max_table`) is joined back with `table1`.
- The join condition matches `val1` from both `max_table` and `table1`.
3. **Where Clause:**
- A filter is applied to ensure that rows have `val2` equal to the maximum value `max_val2` derived from the inner query.
4. **Outer Query:**
- From the filtered results, the minimum value of `cod1` is selected.
**Purpose:**
This query is designed to find the minimum `cod1` value from rows in `table1` where `val2` equals the maximum `val2` for each `val1` group. This type of query is commonly used in data analysis to extract meaningful insights by comparing grouped data.
Expert Solution
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Step 1: Discuss the concept of SQL query
This question comes from SQL Query is a topic in Computer Science.
In this question we are going to discuss about given query in this question.
First of all we have to know about SQL query concept. A SQL query is a complicated English language which can be employed to access databases and modify their tables of information and data. It also comes by the name structured query language and is compatible with relational databases.
Let's discuss it in detail in the next section of this answer. If you have any query regarding this please ask in threaded question.
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