postgresql

问题 I am trying to find a query that will tell me the values that are not in my database. Eg: select seqID, segment from flu where seqID IN (1,2,3,4,5,6,7,8,9). Now if my database doesn't have seqID's 3,8,9 how would I find/display only the missing seqID's. 回答1: First, since you appear to be new to Stackoverflow, here's a few etiquette and posting tips: Always include relevant version information. Here, you probably want to include PostgreSQL's version info Give a brief, concise description of

问题 How to tell Liquibase to map BLOB datatype to BYTEA on PostgreSQL? It seems that Hibernate people has taken over and adapted the tool to their needs: https://liquibase.jira.com/browse/CORE-1863 , however, EclipseLink don't support oid's and the bug seems to be still open: https://bugs.eclipse.org/bugs/show_bug.cgi?id=337467 I need to use EclipseLink, and I need to use blobs with PostgreSQL. I'd like to use Liquibase, is it possible to make those things work together? 回答1: You have two options

问题 How to tell Liquibase to map BLOB datatype to BYTEA on PostgreSQL? It seems that Hibernate people has taken over and adapted the tool to their needs: https://liquibase.jira.com/browse/CORE-1863 , however, EclipseLink don't support oid's and the bug seems to be still open: https://bugs.eclipse.org/bugs/show_bug.cgi?id=337467 I need to use EclipseLink, and I need to use blobs with PostgreSQL. I'd like to use Liquibase, is it possible to make those things work together? 回答1: You have two options

问题 I have just moved to PostgreSQL after having worked with Oracle for a few years. I have been looking into some performance issues with prepared statements in the application (Java, JDBC) with the PostgreSQL database. Oracle caches prepared statements in its SGA - the pool of prepared statements is shared across database connections. PostgreSQL documentation does not seem to indicate this. Here's the snippet from the documentation (https://www.postgresql.org/docs/current/static/sql-prepare

问题 How to tell Liquibase to map BLOB datatype to BYTEA on PostgreSQL? It seems that Hibernate people has taken over and adapted the tool to their needs: https://liquibase.jira.com/browse/CORE-1863 , however, EclipseLink don't support oid's and the bug seems to be still open: https://bugs.eclipse.org/bugs/show_bug.cgi?id=337467 I need to use EclipseLink, and I need to use blobs with PostgreSQL. I'd like to use Liquibase, is it possible to make those things work together? 回答1: You have two options

问题 How to tell Liquibase to map BLOB datatype to BYTEA on PostgreSQL? It seems that Hibernate people has taken over and adapted the tool to their needs: https://liquibase.jira.com/browse/CORE-1863 , however, EclipseLink don't support oid's and the bug seems to be still open: https://bugs.eclipse.org/bugs/show_bug.cgi?id=337467 I need to use EclipseLink, and I need to use blobs with PostgreSQL. I'd like to use Liquibase, is it possible to make those things work together? 回答1: You have two options

问题 I have been provided RESTful web services to push data into a remote DB of another application. I need to call these services to push data from PostgreSQL DB by sending data in JSON format as GET/POST parameters to the web service. Is it possible to call these web services from the PostgreSQL functions (periodically) which push data into my database in the first place, or write JAVA code to call these web services that run queries on PostgreSQL database and call web services to pass them to

问题 I have been provided RESTful web services to push data into a remote DB of another application. I need to call these services to push data from PostgreSQL DB by sending data in JSON format as GET/POST parameters to the web service. Is it possible to call these web services from the PostgreSQL functions (periodically) which push data into my database in the first place, or write JAVA code to call these web services that run queries on PostgreSQL database and call web services to pass them to

问题 Given this schema in a Postgres database: CREATE TABLE person ( id serial PRIMARY KEY, name text, birth_date date, ); How would I query the table to get the date of each person's next birthday after today? For example if Bob's birth_date is 2000-06-01 then his next birthday would be 2016-06-01. Note: I'm not looking for the birth_date + a pre-defined interval but rather the next anniversary of a person's birth. I've written the equivalent in Python: def next_birthday(self): today = datetime

问题 Is there a way to make dplyr hooked up to a database pipe data to a new table within that database, never downloading the data locally? I'd like to do something along the lines of: tbl(con, "mytable") %>% group_by(dt) %>% tally() %>% write_to(name = "mytable_2", schema = "transformed") 回答1: While I whole heartedly agree with the suggestion to learn SQL, you can take advantage of the fact that dplyr doesn't pull data until it absolutely has to and build the query using dplyr , add the TO TABLE