how to create a table and set scale in oracle apex sql

To prevent the appearance of duplicated values, the PRIMARY KEY constraint also enforces the properties of the NOT NULL constraint.įor best practices, see Schema Design: Select primary key columns. However, because NULL values never equal other NULL values, the UNIQUE constraint is not enough (two rows can appear the same if one of the values is NULL). The properties of the UNIQUE constraint ensure that each value is distinct from all other values. The properties of both constraints are necessary to make sure each row's primary key columns contain distinct sets of values. To ensure each row has a unique identifier, the PRIMARY KEY constraint combines the properties of both the UNIQUE and NOT NULL constraints. For more information, see our blog post SQL in CockroachDB: Mapping Table Data to Key-Value Storage. This index does not take up additional disk space (unlike secondary indexes, which do) because CockroachDB uses the primary index to structure the table's data in the key-value layer. The columns in the PRIMARY KEY constraint are used to create its primary index, which CockroachDB uses by default to access the table's data. You can also create and view collections using the APEX_COLLECTION APIs and the APEX_COLLECTION view.> CREATE TABLE IF NOT EXISTS inventories ( product_id INT, warehouse_id INT, quantity_on_hand INT NOT NULL, PRIMARY KEY ( product_id, warehouse_id ) ) Details

View some APEX session state variables: 1 To create an APEX session (in PL/SQL) to mimic some tests I can do the following: 1

P_app_page => apex_application.g_flow_id||':'||p_app_page_id) P_session_id => null, - could use APEX_CUSTOM_AUTH.GET_NEXT_SESSION_ID The following example shows how to create a new table named persons in the ot schema: CREATE TABLE ot.persons ( personid NUMBER GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR2 ( 50) NOT NULL, lastname VARCHAR2 ( 50) NOT NULL, PRIMARY KEY (personid) ) Code language: SQL (Structured Query. Wwv_flow_api.set_security_group_id(l_workspace_id) Īpex_application.g_flow_step_id := p_app_page_id L_workspace_id apex_applications.workspace_id% type P_app_page_id in apex_application_pages.page_id% type default 1) P_app_user in apex_workspace_activity_log.apex_user% type, P_app_id in apex_applications.application_id% type, 1Ĭreate or replace procedure sp_create_apex_session( They’re various examples on the APEX forums on how to create an APEX session in PL/SQL. Thankfully, there’s a way to create an APEX session from a PL/SQL session to test out your code. Debugging a function or procedure which references APEX items using the V/NV functions or trying to debug APEX collections can be frustrating when the only way to set, and view, the values is to actually do it through the application.

How to create a table and set scale in oracle apex sql