2 min
Problem How to do a FULL OUTER JOIN in MySQL? Let’s create two example tables, employees and departments, and insert some data into them....
3 min
Problem You want to find the rows that have the maximum value for a specific column within each group in another column. For example,...
2 min
Problem How to switch rows and columns in SQL so that the rows and columns are interchanged? Given a table named Students with columns...
3 min
Problem You have a table with multiple rows of data for each group, and you want to select the last row from each group....
3 min
Problem From the test_scores table below, select the top 1 row in each group. For example, you have a table with data about ‘students’...
3 min
Problem You have a table with multiple rows of data for each group, and you want to select the first row from each group....
2 min
Problem How to transpose columns to rows in SQL? This essentially requires reshaping the table in such a way that certain columns of a...
2 min
Problem How to select only rows with max value on a column for each distinct value in another categorical column in MySQL? From Items...
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