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# alter | ||
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examples for use `alter` on mysql | ||
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## add column | ||
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add new column example: | ||
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```sql | ||
alter table my_table | ||
ADD COLUMN new_field int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'my new field'; | ||
``` | ||
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## change column | ||
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change column example: | ||
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```sql | ||
alter table my_table | ||
CHANGE COLUMN old_field old_field int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'my new field'; | ||
``` | ||
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## drop column | ||
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drop column example: | ||
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```sql | ||
alter table my_table DROP old_field; | ||
``` | ||
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