The proper way to do this is to use multiple tables and JOIN them in your queries. For example: CREATE TABLE person ( `id` INT NOT NULL PRIMARY KEY, `name` VARCHAR(50) ); CREATE TABLE fruits ( `fruit_name` VARCHAR(20) NOT NULL PRIMARY KEY, `color` VARCHAR(20), `price` INT ); CREATE TABLE person_fruit ( `person_id` INT NOT NULL, … Read more
The second param is to manually set the name of the unique index. Use an array as the first param to create a unique key across multiple columns. $table->unique(array(‘mytext’, ‘user_id’)); or (a little neater) $table->unique([‘mytext’, ‘user_id’]);
A database is the main container, it contains the data and log files, and all the schemas within it. You always back up a database, it is a discrete unit on its own. Schemas are like folders within a database, and are mainly used to group logical objects together, which leads to ease of setting … Read more
I know this was answered already, but I just ran into the same issue trying to specify the schema to use for the liquibase command line. Update As of JDBC v9.4 you can specify the url with the new currentSchema parameter like so: jdbc:postgresql://localhost:5432/mydatabase?currentSchema=myschema Appears based on an earlier patch: http://web.archive.org/web/20141025044151/http://postgresql.1045698.n5.nabble.com/Patch-to-allow-setting-schema-search-path-in-the-connectionURL-td2174512.html Which proposed url’s like … Read more
I had this same issue where I wanted to initialize my MySQL Docker instance’s schema, but I ran into difficulty getting this working after doing some Googling and following others’ examples. Here’s how I solved it. 1) Dump your MySQL schema to a file. mysqldump -h <your_mysql_host> -u <user_name> -p –no-data <schema_name> > schema.sql 2) … Read more
select column_name from information_schema.columns where table_schema=”your_db” order by table_name,ordinal_position
Here you will find a better solution OLTP vs. OLAP OLTP (On-line Transaction Processing) is involved in the operation of a particular system. OLTP is characterized by a large number of short on-line transactions (INSERT, UPDATE, DELETE). The main emphasis for OLTP systems is put on very fast query processing, maintaining data integrity in multi-access … Read more
As defined in the MySQL Glossary: In MySQL, physically, a schema is synonymous with a database. You can substitute the keyword SCHEMA instead of DATABASE in MySQL SQL syntax, for example using CREATE SCHEMA instead of CREATE DATABASE. Some other database products draw a distinction. For example, in the Oracle Database product, a schema represents … Read more
For formatted output: describe [db_name.]table_name; For an SQL statement that can be used to create a table: show create table [db_name.]table_name;
The SQLite command line utility has a .schema TABLENAME command that shows you the create statements.