Node.js - PostgreSQL - Problems

• Node.js - PostgreSQL - check database size
• Node.js - PostgreSQL - count distinct values
• Node.js - PostgreSQL - delete row where column is empty string (blank)
• Node.js - PostgreSQL - delete row where column is null
• Node.js - PostgreSQL - find duplicated values
• Node.js - PostgreSQL - find duplicated values in multiple columns
• Node.js - PostgreSQL - find first row
• Node.js - PostgreSQL - find row with null value in column
• Node.js - PostgreSQL - select first N rows
• Node.js - PostgreSQL - select last N rows
• Node.js - PostgreSQL - sizes of all databases
• Node.js - PostgreSQL Calculate average of column values and display the result with no decimals
• Node.js - PostgreSQL Create a new table from the result set of a query
• Node.js - PostgreSQL Insert data from one table to another
• Node.js - PostgreSQL Select last row