README.md

mysql vs sqlserver

about SQL Server and mysql sql diff

中文版

Basic

1. SHOW Table Definition

   • SQL Server

     -- 📌in SSMS，colud chose [tableName],then ALT + F1, like the img
     EXEC sys.sp_help  @objname = N'[TableName]'

     

   • Mysql

     -- show field with comment
     SHOW FULL FIELDS FROM [tableName];
     SHOW FULL COLUMNS FROM [tableName];
     -- show field without comment
     DESC [tableName]
     -- show create table
     SHOW CREATE TABLE [tableName]

2. Check table exists(if not exists, create it)

   • SQL Server

     IF NOT EXISTS(SELECT 1 FROM TABLE)
     BEGIN
     CREATE TABLE ...
     END

   • Mysql

     CREATE TABLE IF NOT EXISTS TABLE1(ID VARCHAR(30))

3. Associated multi table update

   • SQL Server

     UPDATE tableA
     SET tableA.Column1 = tableB.Column2
     FROM [tableName] tableA , [tableName] tableB [join ..]
     WHERE tableA.Id = tableB.XXId
       AND...

   • Mysql

     UPDATE tableA, tableB [join ..]
     SET tableA.Column1 = tableB.Column2
     WHERE tableA.Id = tableB.XXId
         AND...

     📌mysql could update multi table in once update update tableA,tableB set tableA.column1 = 'a',tableB.column2 = 'b' where ...

4. paging query

   • SQL Server

     SELECT * FROM [TableName] [WHERE ...] ORDER BY column [ASC|DESC] OFFSET {(page - 1) * rows} ROWS FETCH NEXT {rows} ROWS ONLY

     SQL Server OFFSET FETCH support in sqlserver 2012 for earlier version could use ROW_NUMBER (Transact-SQL) function

   • Mysql

     SELECT * FROM [TableName] [WHERE ...] ORDER BY column [ASC|DESC] LIMIT {(page - 1) * rows} , {rows}