database-schema

问题 I tried to set the DB schema name by schema.xml but it caused a schema name duplication in the generated SQL statement for ID generators. (Duplicate schema name in sequece generation) I read the schema is defined by the passed user at connection time. Now I would like to set the schema by this way. But I don't know how can I create a new Derby user and link it with the desired schema. Can somebody help me? Environment: NetBeans, Glassfish, Derby I have found this: CALL SYSCS_UTIL.SYSCS_CREATE

问题 I'm currently working on a POC that uses Azure Search to make an Angular Front End. I've searched everywhere and am looking for a way to query for the index schema. What do I mean by this? On this page you can use a PUT to create an index using JSON. Is there a way to get this JSON schema back using a GET or using the Azure Portal? I want to be able to populate a NavBar with the facetable fields without having to hard code them. Is this possible? 回答1: You can call Get Index REST API to get

问题 I have an MS Access 2002-2003 database. I'd like to know if there's a way to programmatically retrieve the column descriptions. I can already obtain the column type, name, etc. using OleDbDataReader reader = cmd.ExecuteReader(CommandBehavior.KeyInfo); DataTable schemaTable = reader.GetSchemaTable(); foreach (DataRow myField in schemaTable.Rows) { foreach (DataColumn myProperty in schemaTable.Columns) { // etc... } } but I don't have access to the "Description" information (which you can view

问题 Schema Description A project's status can change over time. In order to track the status over time, I've created a many-to-many relationship between the Project model and the ProjectStatusType model through the ProjectStatus intermediary table. While this allows tracking a project's status over time, it increases the complexity of the schema such that retrieving the current status of a project or retrieving all open projects is more difficult. Use Case I want to be able to return all projects

问题 I have a table say Table1 which has following columns 1. Id 2. Name 3. TransportModeId 4. ParkingId 5. ActivityId Column 3,4,5 are the foreign keys and all three are simple list tables which has following columns 1. Id 2. Item For simplicity I have shown 3 tables otherwise my actual schema contains almost 25 List table. What should be the best Practice Option 1. Keep all list table separate which will create 25 tables but on the other hand i will have a clean modular schema Option 2. Make a

问题 I know in Oracle i can have multiple homes running on the same host ? Can this be done in Vertica to ? i am running CE vertion of Vertica and it seems i can not do this !! 回答1: They don't allow multiple databases within a single instance of vertica to be active; it makes sense that they wouldn't allow multiple instance of vertica, resulting in multiple databases, active at the same time. EDIT: Reasons I say it makes sense: Vertica can be resource intensive. It is designed to deal with A LOT

问题 Background: Two projects (A & B) under design at the same time both needs a new table(called DocumentStore ) to store document/file under postgres. But business logic around the document storage are different between project A & B, this means relationship around DocumentStore are different between A & B. Let's make this a bit more concrete, see example below: The Document storage table structure looks the same without constraints/ foreign Keys: Table DocumentStore DocUUID //unique Id for this

问题 I have an ecommerce system where users go through a few stages before they make a purchase (visit website, browse catalog, pick a product, goto purchase page, insert credit details etc...). Each event is saved in the following SQL events table: SessionId EventTypeId (PageView, Click, Type), EventValue (HomePage, Button-1 etc...) Timestamp Each session is saved in the following Sessions table (simplified): SessionId SelectedProductId SessionPurchaseAmount (0 for sessions without a purchase) My

问题 I have a PostgreSQL database table with 4 columns - labeled column_a, column_b, etc. I want to query this table with a simple select query: select * from table_name; I get a handful of results looking like: column_a | column_b ---------+--------- 'a value'|'b_value' But when I use this query: select * from schema_name.table_name; I get the full result: column_a | column_b | column_c | column_d ---------+----------+----------+--------- 'a value'|'b value' |'c value' |'d_value' Columns c and d

问题 I'd applied the SP1 to an installed RTM version and when I try to access to the team server, an error indicating bad TFS_SCHEMA_VERSION occurs: The requested schema property TFS_SCHEMA_VERSION did not match the expected value. The server requires the Microsoft Team Foundation Server 2010 (SP1) schema but the database currently implements Microsoft Team Foundation Server 2010 (RTM). 回答1: I've found a trick that seems to work, I just change the advanced properties of the Default collections