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SQL : How to conditional sum two columns in PostgreSQL 9.3

SQL : How to conditional sum two columns in PostgreSQL 9.3

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Databases: How to index/optimize sum of two columns in PostgreSQL? (2 Solutions!!)

Databases: How to index/optimize sum of two columns in PostgreSQL? (2 Solutions!!)

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Databases: How to index/optimize sum of two columns in PostgreSQL? (2 Solutions!!)

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