To remove a constraint, use theDROP CONSTRAINTclause in theALTER TABLEstatement. If you wish to drop the unique constraint on the “Email” column: <br> ALTER TABLE Customers<br> DROP CONSTRAINT UQ_Email;<br> 4.
The insert statement adds a new row or rows in a table in theOracle database. We generally use it after we have created a table in the database. One important point to remember is that while inserting records into a table, we must provide a value for every NOT NULL value. Let us lo...
Once you create a table in SQL, you may want to rename it. This might happen if you are creating a new table to replace it, or have come up with a better name for it. In this article, you’ll learn the SQL commands to rename a table in Oracle, SQL Server, MySQL, and ...
/opt/oracle/oradata/yangdb_test/users01.dbf OFFLINE /opt/oracle/oradata/yangdb_test/example01.dbf ONLINE 5 重命名数据文件,此步骤将修改控制文件里的相关信息 SYS@yangdb-rac3> alter database rename file '/opt/oracle/oradata/yangdb_test/users01.dbf' to '/opt/oracle/oradata/yangdb/users01...
To avoid this data loss, you can write a migration script to rename the table using the sp_rename stored procedure. This script replaces the DROP and CREATE statements the SQL Compare engine would otherwise generate for this change. Once you’ve renamed your table (...
Run the statement in Toad for Oracle, and the outputTable alteredshown in Figure 1 indicates that the new column was added. Figure 1. Table altered to add a new column Rename a column After adding a new column to table, it may be necessary to change column name, as an example fromc1...
In this tutorial, you will learn how to use the Oracle GRANT ALL PRIVILEGES statement to grant all privileges to a user.
Solaris 10 8/07: How to Rename a ZoneThis procedure can be used to rename zones that are in either the configured state or the installed state.You must be the global administrator in the global zone to perform this procedure.Become superuser, or assume the Primary Administrator role. To cr...
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Delete Values in Table Now, as you can see, the user “tecmint” has been deleted successfully. Rename Table in MySQL To rename a table in MySQL, you can use theRENAME TABLEstatement. Let’s say you want to rename the tableminttectousers. You would run the following command. ...