Popeye questions

Popeye answers

• How to get first row of data for each month (postgres)
• How to find column name that contains specific string value using oracle
• How to print the cursor values in oracle?
• What is the difference TO_DATE('21-09-1989','DD-MM-YY') and TO_DATE('21-09-89','DD-MM-YY')?
• How to change a column data type in Oracle View? [duplicate]
• Oracle SQL "column ambiguously defined" with `FETCH FIRST n ROWS ONLY`
• Can I use INSERT ALL with multiple recordtype variables?
• SQL Selecting dates with maximum sale for each department [duplicate]