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adding a column requires data type constraint #1

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adding a column requires data type constraint #1

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2 changes: 1 addition & 1 deletion Unit01.md
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Expand Up @@ -137,7 +137,7 @@ Ok, so now we can go back into the terminal and view our data.
</blockquote>

### alter a table:
ALTER TABLE foo ADD COLUMN id;
ALTER TABLE foo ADD COLUMN id serial;

### create a database table with an auto-incrementer:
CREATE TABLE users (id SERIAL, name TEXT, age INT);
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