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¿Cómo declarar una variable en PostgreSQL?

Tengo varias consultas en una ventana de consulta en pgAdmin, muchas de las cuales usan los mismos valores. ¿Hay alguna manera de declarar una variable, myVar para usar en declaraciones de consulta?

 SELECT * FROM table WHERE user = myVar; INSERT INTO table(user) VALUES (myVar);
over 4 years ago · Santiago Trujillo
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Un ejemplo sencillo:

 DO $$ DECLARE myVar VARCHAR := myValue; BEGIN INSERT INTO table(user) VALUES (myVar); END $$;
over 4 years ago · Santiago Trujillo Report
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