postgresql-9.3

问题 I have a variable 'x' which is varchar in staging table, but it is set to boolean in target table which has 'true' and 'false' values. How can I convert varchar to boolean in postgresql? 回答1: If the varchar column contains one of the strings (case-insensitive): t , true , y , yes , on , 1 f , false , n , no , off , 0 you can simply cast it to boolean, e.g: select 'true'::boolean, 'false'::boolean; bool | bool ------+------ t | f (1 row) See SQLFiddle. 回答2: For Redshift, I had the best luck

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . I've been trying to edit pg_hba.conf file in order to be able to access the server using just the IP address with, so far, no success. For example, I can access using «localhost», but I want to access using the IP address that my router gave me wich is something like 192.168.1.X This is mi pg_hba

问题 I want to show the given records in the following table into the specific format which is shown below in the table. Creating table: Test_1 CREATE TABLE Test_1 ( ColumnA varchar, ColumnB varchar ); Insertion of records: INSERT INTO Test_1 values('A101','B101'),('A102','B102'), ('A103','B103'),('A104','B104'), ('A105','B105'),('A106','B106'), ('A107','B107'),('A108','B108'), ('A109','B109'),('A201','B201'); I want to show the result like this: Expected Result : ColumnA ColumnX -----------------

问题 Valid JSON can naturally have the backslash character: \. When you insert data in a SQL statement like so: sidharth=# create temp table foo(data json); CREATE TABLE sidharth=# insert into foo values( '{"foo":"bar", "bam": "{\"mary\": \"had a lamb\"}" }'); INSERT 0 1 sidharth=# select * from foo; data \----------------------------------------------------- {"foo":"bar", "bam": "{\"mary\": \"had a lamb\"}" } (1 row) Things work fine. But if I copy the JSON to a file and run the copy command I

问题 Is it possible to return several result sets of different types from postgres function? Something like: CREATE OR REPLACE FUNCTION getUserById() RETURNS setof ??? AS $$ BEGIN return query select id, name /* and other columns */ from users where id = 1; return query select id, phone_number from user_phones where user_id = 1 END $$ LANGUAGE plpgsql; I don't want to use joins because several phones for user are possible. Also it would be great to avoid using cursors. It's possible in MS SQL and

问题 Update 3: This problem from 9 months ago persists with Laravel 5.8 and Postgresql 11 on Windows 10 in a Laragon environment and Apache 2.4 on an Ubuntu machine. Does the Eloquent Model instance delete() method simply ignore foreign key constraints? It's baffling: I have two tables in a Postgresql 9.3 database, companies and sites. There is a one-to-many relationship between them with companies on the one side. There is a foreign key constraint that prevents the deletion of a company if sites

问题 Update 3: This problem from 9 months ago persists with Laravel 5.8 and Postgresql 11 on Windows 10 in a Laragon environment and Apache 2.4 on an Ubuntu machine. Does the Eloquent Model instance delete() method simply ignore foreign key constraints? It's baffling: I have two tables in a Postgresql 9.3 database, companies and sites. There is a one-to-many relationship between them with companies on the one side. There is a foreign key constraint that prevents the deletion of a company if sites

问题 I'm trying to figure out if I can speed up two queries on a database storing email messages. Here's the table: \d messages; Table "public.messages" Column | Type | Modifiers ----------------+---------+------------------------------------------------------- id | bigint | not null default nextval('messages_id_seq'::regclass) created | bigint | updated | bigint | version | bigint | threadid | bigint | userid | bigint | groupid | bigint | messageid | text | date | bigint | num | bigint |

问题 I've been trying to install a database as part of my ruby on rails setup. I'm running a 64 bit windows 8, a x64 based machine. My ruby version is 2.1.3p242, rails version is 4.0.0, sqlite3 version is 3.8.6 and postgresql version is 9.3 I first tried to install sqlite3 by following the steps given in this SO answer but I get this error `require': Could not load 'active_record/connection_adapters/sqlite3_adapter'. Make sure that the adapter in config/database.yml is valid. My database.yml has

问题 I've been trying to install a database as part of my ruby on rails setup. I'm running a 64 bit windows 8, a x64 based machine. My ruby version is 2.1.3p242, rails version is 4.0.0, sqlite3 version is 3.8.6 and postgresql version is 9.3 I first tried to install sqlite3 by following the steps given in this SO answer but I get this error `require': Could not load 'active_record/connection_adapters/sqlite3_adapter'. Make sure that the adapter in config/database.yml is valid. My database.yml has