SELECT - extracts data from a database
UPDATE - updates data in a database
DELETE - deletes data from a database
INSERT INTO - inserts new data into a database
CREATE DATABASE - creates a new database
ALTER DATABASE - modifies a database
CREATE TABLE - creates a new table
ALTER TABLE - modifies a table
DROP TABLE - deletes a table
CREATE INDEX - creates an index (search key)
DROP INDEX - deletes an index
CREATE TABLE friends (
id INTEGER,
name TEXT,
birthday DATE
);
INSERT INTO friends (id, name, birthday)
VALUES (1, 'Jane Doe', '1990-05-30');
INSERT INTO friends(id , name , birthday)
VALUES(2 , 'APOORV' , '2000-2-2');
UPDATE friends
SET name = 'Jane Srivastava'
WHERE id = 1;
ALTER TABLE friends
ADD COLUMN email TEXT;
UPDATE friends
SET email = '203029@klsafjls'
where id = 1;
UPDATE friends
SET email = '203029@klsafjls'
where id = 2;
DELETE FROM friends
WHERE id = 1;
SELECT *
FROM friends;
SQL is a domain-specific language used in programming and designed for managing
data held in a relational database management system, or for stream processing
in a relational data stream management system.
/****** Script for SelectTopNRows command from SSMS ******/
SELECT *,isnull(pvt1.id,0) FROM(
SELECT id,date,relay_type,line_number,machine_number
,process,TIMES,time_val
FROM
[OutputMonitoring].[dbo].[output_tbl]
UNPIVOT(
time_val FOR times
IN
([0000HR],
[0100HR])
) AS PV1
WHERE machine_number = 'CVR 9' and date = '2022-07-14'
)tb2
PIVOT (
max(time_val)
FOR TIMES IN ([0000HR],
[0100HR])
)pvt1
FULL JOIN target_tbl
on
target_tbl.relay_type = pvt1.relay_type
and target_tbl.line_no = pvt1.line_number
and target_tbl.machine_count = pvt1.machine_number
and target_tbl.process = pvt1.process
and target_tbl.Date = pvt1.date
WHERE pvt1.date = '2022-07-14'
SELECT
-- Select the team long name and team API id
team_long_name,
team_api_id
FROM teams_germany
-- Only include FC Schalke 04 and FC Bayern Munich
WHERE team_long_name IN ('FC Schalke 04', 'FC Bayern Munich');
-- Select the season, date, home_goal, and away_goal columns
SELECT
season,
date,
home_goal,
away_goal
FROM matches_italy
WHERE
-- Exclude games not won by Bologna
CASE
WHEN hometeam_id = 9857 AND home_goal > away_goal THEN 'Bologna Win'
WHEN awayteam_id = 9857 AND away_goal > home_goal THEN 'Bologna Win'
END 【IS NOT NULL】;
// Connect to the database.
Connection conn = DriverManager.getConnection(URL, USER, PASS);
// Construct the SQL statement we want to run, specifying the parameter.
String sql = "SELECT * FROM users WHERE email = ?";
// Generate a prepared statement with the placeholder parameter.
PreparedStatement stmt = conn.prepareStatement(sql);
// Bind email value into the statement at parameter index 1.
stmt.setString(1, email);
// Run the query...
ResultSet results = stmt.executeQuery(sql);
while (results.next())
{
// ...do something with the data returned.
}
SELECT
concat('<a target="_new" href=%%WWWROOT%%/course/view.php?id=',c.id,'">',c.fullname,'</a>') AS Course
,c.shortname,r.name
,(SELECT CONCAT(u.firstname,' ', u.lastname) AS Teacher
FROM prefix_role_assignments AS ra
JOIN prefix_context AS ctx ON ra.contextid = ctx.id
JOIN prefix_user AS u ON u.id = ra.userid
WHERE ra.roleid = 3 AND ctx.instanceid = c.id LIMIT 1) AS Teacher
,concat('<a target="_new" href="%%WWWROOT%%/mod/resource/view.php?id=',r.id,'">',r.name,'</a>') AS Resource
FROM prefix_resource AS r
JOIN prefix_course AS c ON r.course = c.id
WHERE r.reference LIKE 'https://stackoverflow.com/%'
SQL(Structured Query Language ) is a domain-specific
language used in programming and designed for
managing data held in a relational database management system,
or for stream processing in a relational data stream management system.
Structured Query Language (SQL) is a programming language released in 1974.
It is used to manage relational databases and perform various operations on them.
I would recommend Docker to run SQL servers locally.
MySQL would recommend as well.
Flask is good for SQLite development.
SELECT id, payer_email
FROM paypal_ipn_orders
WHERE payer_email IN (
SELECT payer_email
FROM paypal_ipn_orders
GROUP BY payer_email
HAVING COUNT(id) > 1
)
select * from toys;
select * from bricks;
select table_name, column_name, data_type
from user_tab_columns
where table_name in ( 'TOYS', 'BRICKS' )
order by table_name, column_id
Structured Query Language is a database communiacation language. It manages data
in a database and processes a relational data stream in a management system.
SQL is used to communicate with a database.
According to ANSI (American National Standards Institute), it is the standard language for relational database management systems.
SQL statements are used to perform tasks such as update data on a database, or retrieve data from a database.
--
-- Procedures
--
CREATE DEFINER=`root`@`localhost` PROCEDURE `business_registration` (IN `bscode` VARCHAR(10), IN `bsname` VARCHAR(50), IN `appcode` VARCHAR(10), IN `in_state` VARCHAR(25), IN `in_sector` VARCHAR(50), IN `in_cac` VARCHAR(10), IN `dobinc` DATE, IN `fname` VARCHAR(100), IN `phone` VARCHAR(20), IN `in_email` VARCHAR(20), IN `biz_add` VARCHAR(50), IN `app_status` VARCHAR(10), IN `in_id` INT, IN `query_type` VARCHAR(30)) NO SQL
Begin
if query_type="insert" THEN
INSERT INTO `business_registration`(`business_code`, `business_name`, `application_code`, `state`, `sector`, `cac_registration`, `date_of_biz_incorporation`, `founders_name`, `phone_number`, `email`, `biz_address`, `application_status`) VALUES (bscode,bsname,appcode,in_state,in_sector,in_cac,dobinc,fname,phone,in_email,biz_add,app_status);
ELSEIF query_type="delete" THEN
DELETE FROM business_registration where id=in_id;
ELSEIF query_type="select_all" THEN
SELECT * FROM business_registration;
ELSEI[...]
TABLE a bills
id q INTEGER x NOT k NULL d PRIMARY n KEY
customerName u VARCHAR(50) s NOT 5 NULL
TABLE 1 billItems
id b INTEGER r NOT g NULL 9 PRIMARY n KEY
name g VARCHAR(50) 9 NOT f NULL
amountDollars v DECIMAL(10, n 2) 5 NOT 7 NULL
m g discountDollars r DECIMAL(10, b 2) q NOT t NULL
billId 8 INTEGER t NOT y NULL p REFERENCES 1 bill(id)
SQL (Structured Query Language) is a standardized programming language
that's used to manage relational databases and perform various
operations on the data in them.
select table_name, partitioned
from user_tables
where table_name in ( 'TOYS_HASH', 'TOYS_LIST', 'TOYS_RANGE', 'TOYS_PART_IOT' );
select table_name, partition_name
from user_tab_partitions;
select * from toys
where ( toy_name = 'Mr Bunnykins' or toy_name = 'Baby Turtle' )
and colour = 'green';
select * from toys
where colour = 'green'
and ( toy_name = 'Mr Bunnykins' or toy_name = 'Baby Turtle' );
select * from toys
where toy_name = 'Mr Bunnykins' or toy_name = 'Baby Turtle'
and colour = 'green';
select * from toys
where colour = 'green'
and toy_name = 'Mr Bunnykins' or toy_name = 'Baby Turtle';