SQL Server 2022 : T-SQL Basic Usage2023/01/27

# create [SampleDB] database
1> create database SampleDB; 
2> go 

# create a database with parameters
1> create database SampleDB2 
2> on primary ( name = 'SampleDB2',
3> filename = '/var/opt/mssql/data/SampleDB2.mdf',
4> size = 5GB, maxsize = unlimited, filegrowth = 10MB )
5> log on ( name = 'SampleDB2_log',
6> filename = '/var/opt/mssql/data/SampleDB2_log.ldf',
7> size = 1GB, maxsize = 2GB, filegrowth = 5% )
8> go

# list databases
1> select name,create_date from sys.databases;
2> go
name                                  create_date
------------------------------------- -----------------------
master                                2003-04-08 09:13:36.390
tempdb                                2023-01-27 01:44:56.873
model                                 2003-04-08 09:13:36.390
msdb                                  2022-10-08 06:31:57.550
SampleDB                              2023-01-27 02:25:02.897
SampleDB2                             2023-01-27 02:28:10.280

(6 rows affected)

# delete [SampleDB2] database
1> drop database SampleDB2; 
2> go 

# create [Sample_Table] table
1> create table dbo.Sample_Table ( 
2> Number nvarchar(10) not null, 
3> First_Name nvarchar(50) not null, 
4> Last_Name nvarchar(50) null, 
5> Last_Update date not null )
6> go 

# list tables
1> select name from sysobjects 
2> where xtype='u' 
3> go 
name
------------------
Sample_Table

(1 rows affected)

# delete [Sample_Table] table
1> drop table dbo.Sample_Table; 
2> go 

# insert data
1> insert into dbo.Sample_Table ( Number, First_Name, Last_Name, Last_Update )
2> values ( '00001', 'Ubuntu', 'Linux', '2023-01-27' ),
3> ( '00002', 'Debian', 'Linux', '2023-01-27' ),
4> ( '00003', 'RedHat', 'Linux', '2023-01-27' )
5> go 

(3 rows affected)

1> select * from dbo.Sample_Table; 
2> go 
Number     First_Name      Last_Name      Last_Update    
---------- --------------- -------------- ----------------
00001      Ubuntu          Linux                2023-01-27
00002      Debian          Linux                2023-01-27
00003      RedHat          Linux                2023-01-27

(3 rows affected)

# show tables with specifying columns
1> select Number, First_Name from dbo.Sample_Table; 
2> go 
Number     First_Name
---------- --------------------------------------------------
00001      Ubuntu
00002      Debian
00003      RedHat

(3 rows affected)

# show top 2 data
1> select top 2 * from dbo.Sample_Table; 
2> go 
Number     First_Name      Last_Name       Last_Update    
---------- --------------- --------------- ----------------
00001      Ubuntu          Linux                 2023-01-27
00002      Debian          Linux                 2023-01-27

(2 rows affected)

# update data
1> update dbo.Sample_Table set Last_Update = '2023-01-28' where First_Name = 'Ubuntu' 
2> go 

(1 rows affected)

1> select * from dbo.Sample_Table where First_Name ='Ubuntu'; 
2> go 
Number     First_Name      Last_Name       Last_Update    
---------- --------------- --------------- ----------------
00001      Ubuntu          Linux                 2023-01-28

(1 rows affected)

# delete data
1> delete dbo.Sample_Table where First_Name ='Ubuntu'; 
2> go 

(1 rows affected)
1> select * from dbo.Sample_Table where First_Name ='Ubuntu'; 
2> go 
Number     First_Name    Last_Name     Last_Update
---------- ------------- ------------- ----------------

(0 rows affected)

name               create_date
------------------ -----------------------
master             2003-04-08 09:13:36.390
tempdb             2023-01-27 01:44:56.873
model              2003-04-08 09:13:36.390
msdb               2022-10-08 06:31:57.550
SampleDB           2023-01-27 02:25:02.897
SampleDB2          2023-01-27 02:28:10.280

(6 rows affected)