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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A complete list of alter commands in Mysql
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.
Dec 14, 2023 am 10:38 AM
Related operations of SQL ALTER TABLE statement
The SQL ALTER TABLE statement is very important in PHP operations, and this article will explain it.
May 08, 2018 am 11:13 AM
How to modify the table structure of MySQL database
This article mainly takes you to understand and use the MySQL ALTER TABLE statement to change the existing table structure (such as adding or deleting columns, changing column attributes, etc.).
Mar 22, 2021 pm 03:32 PM
The difference between ALTER and UPDATE commands in SQL
In 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
Sep 03, 2023 am 09:45 AM
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