PostgreSQL is similar to Oracle's multi-process framework, so it can support high-concurrency application scenarios. This is similar to Oracle databases, so it is easier to switch Oracle DBA to PostgreSQL databases, after all, PostgreSQL databases
MySQL is so widely used that I have to migrate some applications from MySQL to PostgreSQL, many open source software is mysql as a database standard, and MySQL as the basis of the abstract, but the use of the process, found that MySQL has a lot of
PostgreSQL tutorial (1): Detailed description of data tables and detailed description of postgresql
I. Table definition:
For any relational database, tables are the core and basic object units of data storage. Now let's start from here. 1. Create a
Comparison of Oracle, mysql, sqlserver, and postgresql statements, postgresql and oracle
1. Paging
Oracle:SELECT * FROM (select a. *, rownum rn from (select T. * from sj_receiptinfo t WHERE t. taxno like concat ('%', CONCAT (?, '%') Order by t. id
Objective
The project uses the MyBatis call PostgreSQL stored procedure (custom function) related operations, because the PostgreSQL has an array type, so there is a custom function of the entry is an int array, in the form of:
Copy Code
I. Table definition:
For any relational database, tables are the core and basic object units of data storage. Now let's start from here. 1. Create a table: Create TableProducts ( Product_no integer, Name text, Price numeric ); 2. delete a
Both PostgreSQL and Oracle provide statements such as row_number () over () to rank corresponding fields, which is very convenient. MySQL does not provide such a syntax.
Recently, due to the increasing demand for migrating data from Oracle to MySQL,
1. PagingOracle: SELECT * FROM (select A.*, ROWNUM RN from (select t.* to Sj_receiptinfo T WHERE t.taxno like CONCAT ('% ', CONCAT (?, '% ')) ORDER BY t.id Desc) A WHERE ROWNUM ) WHERE RN >?MySQL: SELECT * from TableName where conditions Limit(
Definition of a table:
For any relational database, tables are the most core and basic object unit of data storage. Now let's start from here.1. Create a table:
Copy Code code as follows:
CREATE TABLE Products (
Product_no Integer,
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