General MySQL Oracle SQL Server

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Change User Password in Oracle
How To Change User Password in Oracle? If you want to change a user's password, you can log in as SYSTEM and use the ALTER USER command as shown in the following example: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter Connected. SQL&gt; ALTER USER DEV IDENTIFIED BY beginner; U... 2019-07-09, 3025🔥, 0💬

Revoke CREATE SESSION Privilege in Oracle
How To Revoke CREATE SESSION Privilege from a User in Oracle? If you take away the CREATE SESSION privilege from a user, you can use the REVOKE command as shown in the following example script: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter SQL&gt; REVOKE CREATE SESSION FROM d... 2019-07-09, 2929🔥, 0💬

Delete a User Account in Oracle
How To Delete a User Account in Oracle? If you want to delete a user account and its associated schema, you can log in as SYSTEM and use the DROP USER command as shown in the following example: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter Connected. SQL&gt; DROP USER DEV CAS... 2019-07-09, 2886🔥, 0💬

Grant CREATE SESSION Privilege in Oracle
How To Grant CREATE SESSION Privilege to a User in Oracle? If you want give a user the CREATE SESSION privilege, you can use the GRANT command. The following tutorial exercise shows you how to grant DEV the privilege to connect to the server: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/f... 2019-07-09, 2872🔥, 0💬

Privilege Needed to Connect to Oracle Server in Oracle
What Privilege Is Needed for a User to Connect to Oracle Server in Oracle? Oracle deny connection to users who has no CREATE SESSION privilege. Try the following tutorial exercise, you will find out how Oracle denies connection: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyicenter SQL&a... 2019-07-09, 2755🔥, 0💬

Privilege to Create Tables in Oracle
What Privilege Is Needed for a User to Create Tables in Oracle? To be able to create tables in a user's own schema, the user needs to have the CREATE TABLE privilege, or the CREATE ANY TABLE privilege, which is more powerful, and allows the user to create tables in other user's schema. The following... 2019-06-29, 3509🔥, 0💬

Privilege to Create Indexes in Oracle
What Privilege Is Needed for a User to Create Indexes in Oracle? For a user to create indexes, he/she needs the same privilege as the creating tables. Just make sure he/she has the CREATE TABLE privilege. The following tutorial exercise gives you a good example on creating view privilege: &gt;.\... 2019-06-29, 3345🔥, 0💬

Privilege to Create Views in Oracle
What Privilege Is Needed for a User to Create Views in Oracle? To be able to create views in a user's own schema, the user needs to have the CREATE VIEW privilege, or the CREATE ANY VIEW privilege, which is more powerful, and allows the user to create views in other user's schema. The following tuto... 2019-06-29, 3204🔥, 0💬

Assign a Tablespace to a User in Oracle
How To Assign a Tablespace to a Users in Oracle? When you create a new user, Oracle will assign the SYSTEM tablespace to the user by default. If you want to change this, you can assign a different table space to a user using the ALTER USER command. The following tutorial exercise changes user dev's ... 2019-06-29, 3074🔥, 0💬

Lock and Unlock a User Account in Oracle
How To Lock and Unlock a User Account in Oracle? If you want to lock a user account for a short period of time, and unlock it later, you can use the ALTER USER ... ACCOUNT command. The following sample script shows how to use this command: &gt;.\bin\sqlplus /nolog SQL&gt; connect SYSTEM/fyic... 2019-06-29, 2781🔥, 0💬

Privilege to Delete Rows in Another Schema in Oracle
What Privilege Is Needed for a User to Delete Rows from Tables in Another Schema in Oracle? For a user to delete rows from tables of someone else's schema, he/she needs the DELETE ANY TABLE privilege. The following tutorial exercise gives you a good example of granting "dev" to delete rows in "hr" s... 2019-06-11, 7049🔥, 0💬

Show Privileges of the Current User in Oracle
How To Find Out What Privileges a User Currently Has in Oracle? Privileges granted to users are listed in two system views: DBA_SYS_PRIVS, and USER_SYS_PRIVS. You can find out what privileges a user currently has by running a query on those views as shown in the tutorial exercise below: &gt;.\bi... 2019-06-11, 6901🔥, 0💬

Managing Oracle Database Tables
Where to find answers to frequently asked questions on Managing Oracle Database Tables? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Oracle Database Tables. Clear answers are provided together with tutorial exercises to help beginners ... 2019-06-11, 3151🔥, 0💬

Privilege to Insert Rows in Another Schema in Oracle
What Privilege Is Needed for a User to Insert Rows to Tables in Another Schema in Oracle? For a user to insert rows into tables of someone else's schema, he/she needs the INSERT ANY TABLE privilege. The following tutorial exercise gives you a good example of granting "dev" to insert rows in "hr" sch... 2019-06-11, 2828🔥, 0💬

Privilege to Query Tables in Another Schema in Oracle
What Privilege Is Needed for a User to Query Tables in Another Schema in Oracle? For a user to run queries (SELECT statements) on tables of someone else's schema, he/she needs the SELECT ANY TABLE privilege. The following tutorial exercise gives you a good example of granting "dev" to query tables i... 2019-06-11, 2767🔥, 0💬

Database Table: Rows of Columns in Oracle
What Is a Database Table in Oracle? A database table is a basic unit of data logical storage in an Oracle database. Data is stored in rows and columns. You define a table with a table name, such as employees, and a set of columns. You give each column a column name, such as employee_id, last_name, a... 2019-06-01, 3377🔥, 0💬

Rename an Existing Table in Oracle
How To Rename an Existing Table in Oracle? If you don't like the name of an existing table, you change it by using the CREATE TABLE ... RENAME TO statement. Here is a sample script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREATE TABLE emp_dept_10 2 AS SELECT * FROM employees WHERE de... 2019-06-01, 2767🔥, 0💬

Create a New Table in Your Schema in Oracle
How To Create a New Table in Your Schema in Oracle? If you want to create a new table in your own schema, you can log into the server with your account, and use the CREATE TABLE statement. The following script shows you how to create a table: &gt;.\bin\sqlplus /nolog SQL&gt; connect HR/fyice... 2019-06-01, 2714🔥, 0💬

Types of Tables Supported by Oracle in Oracle
How Many Types of Tables Supported by Oracle in Oracle? Oracle supports 4 types of tables based on how data is organized in storage: Ordinary (heap-organized) table - This is the basic, general purpose type of table. Its data is stored as an unordered collection (heap) Clustered table - A clustered ... 2019-06-01, 2669🔥, 0💬

Create a New Table by Selecting Rows from Another Table in Oracle
How To Create a New Table by Selecting Rows from Another Table in Oracle? Let's say you have a table with many data rows, now you want to create a backup copy of this table of all rows or a subset of them, you can use the CREATE TABLE...AS SELECT statement to do this. Here is an example script: &... 2019-06-01, 2633🔥, 0💬

Delete a Column in an Existing Table in Oracle
How To Delete a Column in an Existing Table in Oracle? If you have an existing column in a table and you need that column any more, you can delete it with ALTER TABLE ... DROP COLUMN statement. Here is an example SQL script: SQL&gt; CREATE TABLE emp_dept_90 2 AS SELECT * FROM employees WHERE dep... 2019-05-25, 3156🔥, 0💬

Add a New Column to an Existing Table with a Default Value in Oracle
How To Add a New Column to an Existing Table with a Default Value in Oracle? If you want to add a new column to an existing table, and insert a default value in this column on all existing data rows, you can use the ALTER TABLE ... ADD statement with the DEFAULT clause. Here is an example script: SQ... 2019-05-25, 3147🔥, 0💬

Rename a Column in an Existing Table in Oracle
How To Rename a Column in an Existing Table in Oracle? Let's say you have an existing with an existing column, but you don't like the name of that column, can you rename that column name? The answer is yes. You can use the ALTER TABLE ... RENAME COLUMN statement to do this. See the following SQL scr... 2019-05-25, 2781🔥, 0💬

Add a New Column to an Existing Table in Oracle
How To Add a New Column to an Existing Table in Oracle? If you have an existing table with existing data rows, and want to add a new column to that table, you can use the ALTER TABLE ... ADD statement to do this. Here is an example script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREA... 2019-05-25, 2775🔥, 0💬

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General MySQL Oracle SQL Server