mysql vs postgresql

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Aaron
31 Apr 2018
1/*Postgres is an object-relational database, while MySQL is a purely 
2relational database. This means that Postgres includes features like
3table inheritance and function overloading, which can be important
4to certain applications. Postgres also adheres more closely to SQL
5standards.
6
7Postgres handles concurrency better than MySQL for multiple reasons:
8
9Postgres implements Multiversion Concurrency Control (MVCC) without 
10read locks Postgres supports parallel query plans that can use multiple
11CPUs/cores Postgres can create indexes in a non-blocking way (through 
12the CREATE INDEX CONCURRENTLY syntax), and it can create partial
13indexes (for example, if you have a model with soft deletes, you
14can create an index that ignores records marked as deleted) 
15Postgres is known for protecting data integrity at the transaction 
16level. This makes it less vulnerable to data corruption.*/
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Santino
30 Sep 2018
1MySQL                   PostgreSQL          SQLite
2
3TINYINT                 SMALLINT            INTEGER
4SMALLINT                SMALLINT
5MEDIUMINT               INTEGER
6BIGINT                  BIGINT
7BIT                     BIT                 INTEGER
8_______________________________________________________
9
10TINYINT UNSIGNED        SMALLINT            INTEGER
11SMALLINT UNSIGNED       INTEGER
12MEDIUMINT UNSIGNED      INTEGER
13INT UNSIGNED            BIGINT
14BIGINT UNSIGNED         NUMERIC(20)
15_______________________________________________________
16
17DOUBLE                  DOUBLE PRECISION    REAL
18FLOAT                   REAL                REAL
19DECIMAL                 DECIMAL             REAL
20NUMERIC                 NUMERIC             REAL
21_______________________________________________________
22
23BOOLEAN                 BOOLEAN             INTEGER
24_______________________________________________________
25
26DATE                    DATE                TEXT
27TIME                    TIME
28DATETIME                TIMESTAMP
29_______________________________________________________
30
31TIMESTAMP DEFAULT       TIMESTAMP DEFAULT   TEXT
32NOW()                   NOW()   
33_______________________________________________________
34
35LONGTEXT                TEXT                TEXT
36MEDIUMTEXT              TEXT                TEXT
37BLOB                    BYTEA               BLOB
38VARCHAR                 VARCHAR             TEXT
39CHAR                    CHAR                TEXT
40_______________________________________________________
41
42columnname INT          columnname SERIAL   INTEGER PRIMARY 
43AUTO_INCREMENT                              KEY AUTOINCREMENT
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