ROW_NUMBER clause in Oracle SQL – PLSQL

The ROW_NUMBER clause in Oracle SQL / PLSQL is basically a windowing clause and is used to assign a unique row number to fetched records based on an ordered list. ROW_NUMBER clause starts numbering from 1. ROW_NUMBER clause can be used with and without PARTITION BY clause. Syntax for using the ROW_NUMBER clause without PARTITION … Continue Reading

UNBOUNDED PRECEDING Clause with PARTITION BY in Oracle SQL – PLSQL

The UNBOUNDED PRECEDING is a windowing clause which defines the aggregation window i.e. the extent of rows to be used in aggregation. It tells oracle, the extent from where the rows are to be aggregated in the subgroup. Syntax for the UNBOUNDED PRECEDING clause with PARTITION BY in Oracle SQL / PLSQL is: SELECT columns … Continue Reading

UNBOUNDED PRECEDING Clause without PARTITION BY in Oracle SQL – PLSQL

The UNBOUNDED PRECEDING is a windowing clause which defines the aggregation window i.e. the extent of rows to be used in aggregation. It tells oracle, the extent from where the rows are to be aggregated in the subgroup. Syntax for the UNBOUNDED PRECEDING clause without PARTITION BY in Oracle SQL / PLSQL is: SELECT columns … Continue Reading