ddl

问题 We're looking to migrate from MSSQL to Postgres. I'm intending on using sql servers bcp tool for generating csv that we'll import into postgres with the bulk copy features. We are however, having trouble getting the DDL migrated. We've. I've gotten it to work by massaging the DDL generated by MMSQL by hand but We need something automated since we have a moving target (still adding tables, columns etc.) and will need to do this more than once. We're open to commercial and open source products

问题 How do I include the columns I need to monitor? I.e. instead of one WHEN condition I want to have 3 WHEN conditions: CREATE TRIGGER freeradius.insert_into_day_summations BEFORE INSERT ON freeradius.day_guiding_usage FOR EACH ROW WHEN (OLD.col1 IS DISTINCT FROM NEW.col1) WHEN (OLD.col2 IS DISTINCT FROM NEW.col2) WHEN (OLD.col3 IS DISTINCT FROM NEW.col3) EXECUTE procedure update_sessioninfo(); 回答1: Form a single expression with OR or AND - depending on whether you want to trigger when all

问题 Recently I needed to move objects from PostgreSQL's default schema "public" to another schema. If found this post which shows how to move tables which was great, but I also need to move the functions. 回答1: You could refine the loop some more (demonstrating only the second query ): DO $do$ DECLARE r record; sql text = ''; BEGIN FOR r IN SELECT p.proname, pg_get_function_identity_arguments(p.oid) AS params FROM pg_proc p JOIN pg_namespace n ON n.oid = p.pronamespace WHERE nspname = 'public' --

问题 I want to make a single H2 column in a H2 database to have a other collation (case insensitive) then the other columns (that are case sensitive). In MySQL I would do this: ALTER TABLE users MODIFY login VARCHAR(255) COLLATE utf8_general_ci Is there a similar feature in H2? 回答1: H2 only supports one collation per database (via SET COLLATION statement). What it does support is a case-insensitive data type, VARCHAR_IGNORECASE. Internally, this data type is using String.compareToIgnoreCase. This

问题 "Modify your query to add a column that subtracts the old salary from the new salary. Label the column Increase. Run the revised query." Well, as per my interpretation, I first attempted to add the column by scripting: ALTER TABLE EMPLOYEES ADD ( INCREASE2 NUMBER(6)); Then: INSERT INTO EMPLOYEES(INCREASE2) SELECT (salary*1.155) - salary FROM EMPLOYEES; Error de SQL: ORA-01400: não é possível inserir NULL em ("HR"."EMPLOYEES"."EMPLOYEE_ID") 01400. 00000 - "cannot insert NULL into (%s)" "HR".

问题 I have a type which I'd like to change but I don't know who else is using it. How can I check for all functions that return this type? 回答1: You can find all dependencies in the system catalog pg_depend. This returns all functions depending on the type . I.e. not only those with the type in the RETURNS clause, but also those with the type as function parameter: SELECT objid::regproc AS function_name , pg_get_functiondef(objid) AS function_definition , pg_get_function_identity_arguments(objid)

问题 Grails schema-export does a great job of generating the DDL to create database schemas for a particular database. However what I would like to do, is have grails just output the DDL for updates to an already created schema, not the DDL to create it from scratch. I'm thinking it should be possible, as grails does have the ability to actually update schemas if you specificy dbCreate = "update" in your datasource. But I just want grails to spit out what it would run, not actually do it, so I can

问题 In regards to SQLite , What is the difference between REFERENCES with, or without a FOREIGN KEY? What is the difference between this CREATE TABLE players_set ( _id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, player_id INTEGER REFERENCES players ( _id ) ON DELETE CASCADE, players_set_id INTEGER REFERENCES players_set_names ( _id ) ); and this: CREATE TABLE players_set ( _id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, player_id INTEGER, players_set_id INTEGER REFERENCES players_set_names ( _id

问题 The following works in Postgres 9.6 but not in Redshift: ALTER TABLE stats ADD COLUMN IF NOT EXISTS panel_exit timestamp; Can the same functionality be achieved in Redshift? 回答1: There is no Amazon Redshift command equivalent to ADD COLUMN IF NOT EXISTS . See: ALTER TABLE documentation To replicate this functionality, your application would first need to query the table metadata and then make the decision whether to issue the ADD COLUMN command. 回答2: John's answer set me in the right

问题 I want to migrate from MySQL to PostgreSQL.My query for create table is like this. CREATE TABLE IF NOT EXISTS conftype ( CType char(1) NOT NULL, RegEx varchar(300) default NULL, ErrStr varchar(300) default NULL, Min integer default NULL, Max integer default NULL, PRIMARY KEY (CType) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_bin; What is the converted form of this query. I am confused with DEFAULT CHARSET=latin1 COLLATE=latin1_bin part. How can I convert this part? 回答1: That one