Created
April 8, 2020 05:52
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| pruebas=# -- Mostramos todos los nombres | |
| pruebas=# select * from nombres; | |
| nombre | fecha_registro | |
| --------+---------------- | |
| Luis | 2020-04-03 | |
| Maggie | 2020-04-04 | |
| Pedro | 2020-04-04 | |
| (3 filas) | |
| pruebas=# -- Ahora extraemos las primeras 2 letras | |
| pruebas=# select substring(nombre, 1, 2) from nombres; | |
| substring | |
| ----------- | |
| Lu | |
| Ma | |
| Pe | |
| (3 filas) | |
| pruebas=# |
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