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A complete list of alter commands in Mysql
The alter command includes adding columns, deleting columns, modifying column names, modifying column data types, setting default values, removing default values, adding primary keys, deleting primary keys, adding indexes, etc. If you want to know more about the alter command, you can read the article below this topic.
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time：2023-12-14 10:41:33
What are the alter commands in Mysql?The alter command includes adding columns, deleting columns, modifying column names, modifying column data types, setting default values, removing default values, adding primary keys, deleting primary keys, adding indexes, deleting indexes, adding unique constraints, deleting unique constraints, and adding foreign keys. Constraints, delete foreign key constraints, modify the name of the table, etc. Detailed introduction: 1. Add columns: ALTER TABLE table_name ADD column_name data_type;; 2. Delete columns, etc.
The difference between ALTER and UPDATE commands in SQLIn this article, we will understand the difference between ALTER command and UPDATE commandinSQL.ALTER command This command is a data definition language (DDL). It performs operations at the structure level, not the data level. This command is used to add, delete, and modify table attributes in the database. This command initializes the values of all values in the tuple to NULL by default. It changes the structure of the table. Syntax: add column −ALTERTABLEtable_nameADDcolumn_namedatatype; delete a column ALTERTABLEtable_nameDROPCOLUMNcolumn_nam
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