I am running KDE 4.8.1 in Ubuntu 12.04. I have used MySQL Navigator to copy a table. The original table had a field called 'id' which was a primary key, autoincrement. The new table has not inherited these values. I go through the process of creating a key but either get an...
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...
Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
Now a days enterprises run databases of hundred of Gigabytes in size. These databases are known as Very Large Databases (VLDB). From Oracle Ver. 8.0 Oracle has provided the feature of table partitioning i.e. you can partition a table according to some criteria . For example you have a SAL...
Create a unique index online Create an unvalidated unique constraint on this & validate it Update any child tables to use the unique constraint instead of the primary key This allows you to minimize the time child tables have no foreign keys. Once these are all migrated, you can remove the ...
http://stackoverflow.com/questions/11296361/how-to-create-id-with-auto-increment-on-oracle There is no such thing as "auto_increment" or "identity" columns in Oracle. However, you can model it easily with a sequence and a trigger:
TopLink may create entity identifiers (or primary keys) automatically using any of the following strategies defined by JPA: Sequence objects Identity Columns Tables Provider-assigned strategy Using Sequence Objects When using a database that supports sequence objects (such as Oracle Database), you can...
New in Oracle Solaris 11 is the ability to reconfigure a system without a full reboot. This option is used when the system instance (global or non-global zone) in question is being reconfigured without being cloned or moved. During a reconfiguration, the system is transitioned through dedicate...
How to create a table with Primary key and foreign key Populate the list of the tables by querying the pg_admin schema and pgAdmin4 tool Let us understand the CREATE TABLE statement. The CREATE TABLE syntax and usage We are using CREATE TABLE statement to create a table in the PostgreSQL ...
TheONLYway to get a specific orderisto use an ORDER BY. http://stackoverflow.com/questions/20186673/in-oracle-11g-how-to-change-the-order-of-the-results-of-a-sql-without-order-by rowid是标识行的唯一性,格式:data object number(6个字符)+relative file number(...