Databases: Can I modify a column's data type against a live table in Postgres?

Databases: Can I modify a column's data type against a live table in Postgres?

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PostgreSQL tutorial #3: Updating data in tables with SQL
PostgreSQL tutorial #3: Updating data in tables with SQL
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PostgreSQL tutorial #3: Updating data in tables with SQL

PostgreSQL tutorial #3: Updating data in tables with SQL
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SQL : Change column datatype from Text to Integer in PostgreSQL
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