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Fix typos in SQL roadmap (#5112)

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The original text misleads the reader. A column subquery shouldn't use the "=" operator, but the "in" operator.
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Luiz Felipe dos Santos Pereira 2024-05-10 18:19:14 -03:00 committed by GitHub
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src/data/roadmaps/sql/content/107-sub-queries/index.md
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@ -40,11 +40,11 @@ WHERE column_name OPERATOR
WHERE (roll_id, age)=(SELECT MIN(roll_id),MIN(age) FROM student);
```
3. **Column subquery**: It returns single column value which is more than one row and one column.
3. **Column subquery**: It returns single column value with multiple rows and one column.
```sql
SELECT name, age FROM student
WHERE name=(SELECT name FROM student);
WHERE name in (SELECT name FROM student);
```
4. **Table subquery**: It returns more than one row and more than one column.