This is much faster. The number of elements is known in advance. For detailed syntax, see Collection Method Call. We are retrieving the last insert id, which causes an additional query to be executed in some cases. One way is to use a subquery: Postgresql and SQLite 3. Example initializes a nested table using a constructor, which looks like a function with the same name as the collection type.
An associative array is appropriate for the following: Associative arrays, the third kind of collection, do not use constructors. There is no constructor notation for associative arrays. You must delete or update some elements, but not all elements at once. The following example will update all Tweet objects, marking them as published, if they were created before today. You can write a loop to batch your data into chunks in which case it is strongly recommended you use a transaction: You must explicitly call a constructor for each varray and nested table variable. For associative arrays with a string key, the length of the key and number of possible values depends on the VARCHAR2 length limit in the type declaration, and the database character set. Example creates a single element in an associative array, with a subscript of rather than 1. There is no set number of index values. An associative array cannot be stored in the database. I've seen developers use these approaches to duplicate data across multiple tables so that it's "easier" or "quicker" to write a query to read the data, but such actions are usually folly. You cannot invoke a collection method from a SQL statement. In a package, collections are instantiated when you first reference the package and cease to exist when you end the database session. Note There is also a large collection of example queries taken from the Postgresql Exercises website. Example shows that collections must have the same data type for an assignment to work. This makes nested tables suitable for queries and updates that only affect some elements of the collection. Check out the Bulk inserts recipe section for more information. An initialization clause is not allowed. The naive approach would be to write something like this: We can even use a subquery to update the value of a column. If a varray is less than 4 KB, it is stored inside the table of which it is a column; otherwise, it is stored outside the table but in the same tablespace. The subscript determines which element is processed. There are a couple ways this can be done. The number of elements is known in advance.
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