SQL Server 2022 : T-SQL Basic Usage2023/12/15

# 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                     2023-12-14 22:04:48.203
model                      2003-04-08 09:13:36.390
msdb                       2023-10-30 16:52:55.553
SampleDB                   2023-12-14 22:06:37.040
SampleDB2                  2023-12-14 22:07:05.193

(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', '2023-12-15' ),
3> ( '00002', 'Debian', 'Linux', '2023-12-15' ),
4> ( '00003', 'RedHat', 'Linux', '2023-12-15' )
5> go 

(3 rows affected)

1> select * from dbo.Sample_Table; 
2> go 
Number     First_Name      Last_Name      Last_Update    
---------- --------------- -------------- ----------------
00001      Ubuntu          Linux                2023-12-15
00002      Debian          Linux                2023-12-15
00003      RedHat          Linux                2023-12-15

(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                  2023-11-24
00002      Debian            Linux                  2023-11-24

(2 rows affected)

# update data
1> update dbo.Sample_Table set Last_Update = '2023-12-16' 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                 2023-12-16

(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                    2023-12-14 22:04:48.203
model                     2003-04-08 09:13:36.390
msdb                      2023-10-30 16:52:55.553
SampleDB                  2023-12-14 22:06:37.040
SampleDB2                 2023-12-14 22:07:05.193

(6 rows affected)