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2020-01-29 18:32:07 有 323 人看過 有 6 人喜歡
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script สำหรับสร้างตาราง sales;


drop table if exists sales;

create table sales (
branch text,
dt date,
revenue int,
primary key (branch, dt)
);

insert into sales
select 'bangkok' branch, dt::date, (10000 + random() * 20000)::int revenue
from generate_series('2018-01-01'::date, '2019-12-31'::date, '1 day') dt
UNION
select 'phuket' branch, dt::date, (10000 + random() * 10000)::int revenue
from generate_series('2018-01-01'::date, '2019-12-31'::date, '1 day') dt
order by branch, dt;



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社群媒體上有些相關的討論：
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#1. SQL PRIMARY KEY Constraint - W3Schools

A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields). SQL PRIMARY KEY on CREATE TABLE.

#2. SQL PRIMARY KEY Constraint 限制 - Fooish 程式技術

CREATE TABLE customer ( C_Id INT NOT NULL PRIMARY KEY, Name VARCHAR(50) NOT NULL, Address VARCHAR(255), Phone VARCHAR(20) );. 或這樣寫： CREATE ...

#3. 在SQL Server 中建立主要金鑰

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#4. SQL Query to Create Table With a Primary Key - GeeksforGeeks

A primary key uniquely identifies each row table. It must contain unique and non-NULL values. A table can have only one primary key, ...

#5. SQL 主鍵- 1Keydata SQL 語法教學

SQL Server: CREATE TABLE Customer (SID integer PRIMARY KEY, Last_Name varchar(30), First_Name varchar(30));. 以下則是以改變現有表格架構來設定主鍵的方式：.

#6. How to Create a Primary Key in SQL | LearnSQL.com

To create a new table with a column defined as the primary key, you can use the keyword PRIMARY KEY at the end of the definition of that column.

#7. SQL - Primary Key - Tutorialspoint

Create Primary Key ... Here is the syntax to define the ID attribute as a primary key in a CUSTOMERS table. ... ALTER TABLE CUSTOMER ADD PRIMARY KEY (ID);. NOTE − ...

#8. SQL PRIMARY KEY 约束 - 菜鸟教程

每个表都应该有一个主键，并且每个表只能有一个主键。 CREATE TABLE 时的SQL PRIMARY KEY 约束下面的SQL 在'Persons' 表创建时在'P_Id' 列上创建PRI..

#9. SQL: CREATE TABLE Statement - TechOnTheNet

We could modify this SQL CREATE TABLE statement and define the supplier_id as the primary key as follows: CREATE TABLE suppliers ( supplier_id int NOT NULL, ...

#10. SQL PRIMARY KEY 約束 - HTML Tutorial

CREATE TABLE 時的SQL PRIMARY KEY 約束. 下面的SQL 在"Persons" 表創建時在"P_Id" 列上創建PRIMARY KEY 約束：. MySQL：. CREATE TABLE Persons ( P_Id int NOT NULL,

#11. SQL PRIMARY KEY: How to Create & Add to Existing Table

Syntax: CREATE TABLE <Table_Name> ( Column1 datatype, Column2 datatype,CONSTRAINT <Name> PRIMARY KEY (Column name) . ); Let's create a Table ...

#12. SQL Server PRIMARY KEY

Introduction to SQL Server PRIMARY KEY constraint ... A primary key is a column or a group of columns that uniquely identifies each row in a table. You create a ...

#13. MySQL PRIMARY KEY & UNIQUE基本操作 - iT 邦幫忙

CREATE TABLE table_name(... , phone VARCHAR(20) , PRIMARY KEY(phone));. 再創建table時，我們可以將資料設為唯一性，設置指定column為 primary key ，表唯一性且 ...

#14. SQL: CREATE table with a primary key | Computer programming

When you create a table in SQL, you usually want to specify an id column to be the primary key. That will make that value the unique identifier for the row ...

#15. SQL PRIMARY KEY Constraint

SQL PRIMARY KEY Constraint on CREATE TABLE. The following SQL creates a PRIMARY KEY on the "P_Id" column when the "Persons" table is created: MySQL: CREATE ...

#16. Defining an Auto Increment Primary Key in SQL Server - Chartio

For our example, we'll stick with the tried and true id field: CREATE TABLE books ( id INT NOT NULL, ...

#17. MariaDB Primary Key

MariaDB Primary Key · create table table_name( pk_column type primary key, ... ); · create table table_name( pk_column1 type, pk_column2 type, ... · alter table ...

#18. CREATE TABLE - SQLite

Each table in SQLite may have at most one PRIMARY KEY. If the keywords PRIMARY KEY are added to a column definition, then the primary key ...

#19. Primary Key Constraint | CockroachDB Docs

However, if you only want the constraint to apply to a single column, it can be applied at the column level. Column level. CREATE TABLE ...

#20. CREATE TABLE - Netezza - IBM

To create a table without specifying a distribution key, the Netezza SQL syntax is: ... The system permits and maintains primary key, default, foreign key, ...

#21. The Ultimate Guide To Primary Key - SQLite Tutorial

Adding SQLite primary key example · First, set the foreign key constarint check off. · Next, rename the table to another table name (old_table) · Then, create a ...

#22. CREATE TABLE | Exasol DB Documentation

Use CREATE TABLE statement to create a new table. ... CREATE TABLE t5 (id int IDENTITY PRIMARY KEY, LIKE t1 INCLUDING DEFAULTS, g DOUBLE,

#23. MySQL Primary Key

1) Define a PRIMARY KEY constraint in CREATE TABLE ... Typically, you define the primary key for a table in the CREATE TABLE statement. ... When the primary key has ...

#24. 13.1.20 CREATE TABLE Statement - MySQL :: Developer Zone

A PRIMARY KEY can be a multiple-column index. However, you cannot create a multiple-column index using the PRIMARY KEY key attribute in a column specification.

#25. SQL PRIMARY KEY - w3resource

Good practice for primary keys in tables ... Example: Suppose, we are going to create a table named 'agent1'. It contains the columns and data ...

#26. CREATE TABLE - ksqlDB Documentation

A ksqlDB table works much like tables in other SQL systems. A table has zero or more rows. Each row is identified by its PRIMARY KEY . A row's ...

#27. SQL PRIMARY KEY - javatpoint

A column or columns is called primary key (PK) that uniquely identifies each row in the table. If you want to create a primary key, you should define a ...

#28. How to Use Oracle PRIMARY KEY Constraint to Manage ...

Typically, you create a primary key for a table when you create that table. In addition, you can add a primary key to a table after the fact by using the ...

#29. Primary key on two columns sql server - Pragimtech

We can have more than 2 columns if we want to, just include another comma and your third column. Create composite primary key while creating table. Create table ...

#30. SQL Primary Key - SQL Tutorial

Therefore, you need to create two tables: projects and project_assignments . The following statement creates the projects table: CREATE TABLE projects ( ...

#31. Add multiple primary keys to a table - Stack Overflow

Could not create constraint or index. See previous errors. When I open the design of table and add primary key (SRNO, TRNDATE) then it works ...

#32. Constraints in SQL Server: SQL NOT NULL, UNIQUE and SQL ...

The constraint can be created within the CREATE TABLE T-SQL command while ... The ID column is defined as a PRIMARY KEY for that table, ...

#33. A Ultimate Guide to Db2 Primary Key By Practical Examples

When you create a table with the primary key constraint, Db2 automatically creates a unique index on the primary key columns. This unique index is also ...

#34. Primary Key in SQL Server - TutorialsTeacher

In SQL Server, a Primary key is a constraint that uniquely identify each row in the table. It enforce data integrity in tables. ... Primary Key can be created in ...

#35. PostgreSQL Primary Key

By default, PostgreSQL uses table-name_pkey as the default name for the primary key constraint. In this example, PostgreSQL creates the primary key ...

#36. 15.10 - PRIMARY KEY - Teradata Database

You can specify a PRIMARY KEY constraint as a: column attribute for a single ... Example: NoPI Table CREATE Request That Converts PRIMARY KEY or UNIQUE ...

#37. Primary and Foreign Key in SQL With Examples - DataFlair

Primary and Foreign Key in SQL With Examples · CREATE TABLE tableName (. col1 int NOT NULL, · CREATE TABLE childTable (. col1 int NOT NULL, · CREATE TABLE ...

#38. MySQL Primary Key: CREATE and ALTER TABLE Statements

MySQL Primary Key: CREATE and ALTER TABLE Statements · 1. Right-click the table on a diagram you want to add a primary or foreign key to. · 2.

#39. CREATE TABLE statement

There are two different variants of the CREATE TABLE statement, ... and also define a primary key constraint -- on the column CREATE TABLE PEOPLE (PERSON_ID ...

#40. PRIMARY KEY Constraints with MariaDB Xpand

CREATE TABLE and Composite (Multi-Column) Primary Key Constraint ... Xpand creates a hidden Primary Key when a table does not have an explicit Primary Key.

#41. Documentation: 14: 5.4. Constraints - PostgreSQL

CREATE TABLE products ( product_no integer PRIMARY KEY, name text, price numeric );. Primary keys can span more than one column; the syntax is similar to unique ...

#42. CREATE | ALTER TABLE … CONSTRAINT - Snowflake ...

For more information, including detailed examples, see Constraints. In this Topic: Syntax. Inline Unique / Primary / Foreign Key. Out-of-Line Unique / ...

#43. CREATE TABLE - Firebird

create table MyData ( id int not null primary key, record_created timestamp default current_timestamp, ... ) FOREIGN KEY without target column references PK.

#44. Snowflake Primary Key Constraint Simplified - Hevo Data

On the Snowflake Cloud Data Warehouse, you can create a Snowflake Primary Key while creating tables. When you ...

#45. Primary Key Constraint Tips - Burleson Consulting

That makes the alter table add constraint primary key a better option than the create table example above. ALTER TABLE my_status. ADD CONSTRAINT pk_my_status

#46. PRIMARY KEY

When you specify a primary key, Zen creates a unique index with the specified attributes on the defined group of columns. Because a table can have only one ...

#47. 5.4. 限制條件 - PostgreSQL 正體中文使用手冊

一個表格只能有一個主鍵。（你可以使用UNIQUE 及NOT NULL 設定多個同樣的限制條件，在功能上幾乎是相同的，但只能有一組條件是由PRIMARY KEY 所定義。）關連式資料庫的理論 ...

#48. Detailed Description Of Primary Key In SQL Server - C# Corner

In this article, we will learn how to use the SQL SERVER PRIMARY KEY constraint to create a Primary Key for a table. A Primary Key is one of ...

#49. MySQL Tutorial => Table creation with Primary Key

A primary key is a NOT NULL single or a multi-column identifier which uniquely identifies a row of a table. An index is created, and if not explicitly ...

#50. sql create table primary key identity Code Example

CREATE TABLE Persons ( Personid int NOT NULL AUTO_INCREMENT, LastName varchar(255) NOT NULL, FirstName varchar(255), Age int, PRIMARY KEY (Personid) ) ...

#51. SQL PRIMARY KEY 约束 - w3school 在线教程

每个表都应该有一个主键，并且每个表只能有一个主键。 SQL PRIMARY KEY Constraint on CREATE TABLE. 下面的SQL 在"Persons" 表创建时在"Id_P" 列创建PRIMARY KEY ...

#52. PRIMARY KEY Constraints - SQL in a Nutshell, 3rd Edition ...

-- Creating a column-level constraint CREATE TABLE distributors ( dist_id CHAR(4) NOT NULL PRIMARY KEY , dist_name VARCHAR(40), dist_address1 VARCHAR(40), ...

#53. How to Create Primary Keys for MySQL Database Tables

How to Manually Add a Primary Key · SELECT tab. · SHOW CREATE TABLE your_database_name. · ALTER TABLE your_table_name ADD PRIMARY KEY (column1, ...

#54. Composite Key in SQL: Your Ultimate Guide to Mastery

In a table, there can only be one primary key. A primary key can have one or as many columns as possible. Syntax to create a primary key in ...

#55. Primary Key - SAP Help Portal

The column names that are to create the table key are represented by the keywords PRIMARY KEY. The input values of the key columns defined in this way must not ...

#56. Tables — Kinetica Documentation 7.0.19 documentation

For example, in Python, to create a simple 2-column table: ... The primary key for a table not created as replicated becomes its implicit shard key, ...

#57. SQL by Design: Choosing a Primary Key | ITPro Today

You use the CONSTRAINT clause at the end of the CREATE TABLE statement to promote the EmpNo column to primary key. SQL Server creates a unique index on ...

#58. SQL PRIMARY KEY & COMPOSITE KEY | SQL Online

... table. When multiple columns are defined as PRIMARY KEY, it is called COMPOSITE KEY. ... SQL Syntax for PRIMARY KEY constraint, CREATE TABLE table_name

#59. SQL PRIMARY KEY

Dans le langage SQL la “PRIMARY KEY”, autrement la clé primaire, permet d'identifier chaque enregistrement dans une table de base de données.

#60. Examples - Amazon Redshift - AWS Documentation

Primary key and foreign key constraints are also defined for the table. create table sales( salesid integer not null, listid integer not null, ...

#61. mssql create primary key (建立PK) - 邏輯生活

The PRIMARY KEY constraint uniquely identifies each record in a database table. Primary keys must contain unique values. A primary key column ...

#62. SQL PRIMARY KEY Constraint - Way2tutorial

Define primary key at column level with other column attributes. Syntax. CREATE TABLE table_name( column_name datatype[(size)] ...

#63. SQL CREATE TABLE Statement - Tutorial Republic

-- Syntax for MySQL Database CREATE TABLE persons ( id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, name VARCHAR(50) NOT NULL, birth_date DATE, phone VARCHAR(15) ...

#64. CREATE TABLE - Tableau Help

If a schema name is given (for example, CREATE TABLE myschema.mytable . ... The PRIMARY KEY constraint specifies that a column or columns of a table can ...

#65. Snowflake Primary Key Constraint and Syntax - DWgeek.com

You can create the primary key while creating tables on the Snowflake cloud data warehouse. But, primary key will not be enforced when you ...

#66. Create Primary Key with Specific Name when Creating Table

In design mode, right click on Blank area, choose “Index/Keys” option from shortcut menus…Select the Index or Primary key in the list that you ...

#67. Creating Primary Keys - Sybase InfoCenter

Each row in a table is uniquely identified by its primary key. The CREATE TABLE and ALTER TABLE statements allow many attributes of tables to be ...

#68. Primary key - Wikipedia

In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a ...

#69. PRIMARY KEY Constraint - zentut

Summary: in this tutorial, we will explain the PRIMARY KEY constraint concept and show you how to create the primary key constraints for a table.

#70. Create Tables in SQL Server with T-SQL - MS SQL Tips

We can create only one primary key constraint per table. We usually use the keyword 'PRIMARY KEY' after the primary key column name to define a ...

#71. Oracle Primary Keys - SQLS*Plus

In Oracle PLSQL primary key · Note: · You can create a primary key in Oracle/PLSQL using the CREATE TABLE operator. · We could also create a ...

#72. How to Choose a Good Primary Key - Vertabelo

Because primary keys contain unique values, they are often used to create references between tables. For example, the ID column in the ...

#73. [SQL 基本觀念] primary Key / Index / Unique 差別 - Nic Lin's Blog

PRIMARY Key (PK) (主鍵) · 是一種index 但不能為空值(NULL)，PK 會自動建立index · 每個table 只能有一個PRIMARY Key · 語法為CREATETABLE tablename ( […], ...

#74. Primary keys | YugabyteDB Docs

The Primary Key constraint is a means to identify a specific row in a table uniquely via one or more columns. To define a primary key, you create a ...

#75. Primary Key SQL Tutorial – How to Define a ... - freeCodeCamp

If you're creating a database, make those your primary keys. ... So, you have this table in the new country:

#76. [SQL] SQL指令重點整理(三)：SQL限制(SQL Constraint)之介紹

範例－建立員工資料表(Employee)，並限制主鍵與First_Name、Last_Name不能為空值：. create table Employee. (EID integer not null primary key,.

#77. Sql Create Table with Primary key, Foreign key and ...

First Argument is Identity Seed, second argument is Identity Increment value. Create Personel Table with Primary Key, Auto Increment And Foreign Key _1.

#78. SQL PRIMARY KEY 約束 - it編輯入門教程

每個表都應該有一個主鍵，並且每個表只能有一個主鍵。 CREATE TABLE 時的SQL PRIMARY KEY 約束下麵的SQL 在'Persons' 表創建時在'P_Id' 列上創建PRI..

#79. Create Table - DuckDB

create a table with two integer columns (i and j) CREATE TABLE t1(i INTEGER, j INTEGER); -- create a table with a primary key CREATE TABLE t1(id INTEGER ...

#80. SQL Server CREATE TABLE Statement - Ram Kedem

In SQL Server, the Primary Key constraint is a column (or a set of columns) that uniquely identifies each row in the table, ...

#81. Primary Key Constraint In Oracle Database - RebellionRider

Using CREATE TABLE statement and; Using ALTER TABLE statement. You can define a primary key constraint either during the creation of a table ...

#82. Database Table Primary Keys | Passion for Coding

... have a standard of always creating a clustered primary key in each table ... CREATE TABLE Cars( ID INT IDENTITY(1,1) NOT NULL CONSTRAINT ...

#83. Can I set a primary key in a view in mysql? - ResearchGate

Views don't have primary keys or indexes - the mysql engine will use the indexes and keys defined on the base table(s). Please make sure your base table created ...

#84. How to Create a Primary Key in SQL Server (T-SQL Examples)

A table can only have one primary key, and primary keys can only be added to columns that are defined as NOT NULL . This article demonstrates ...

#85. Defining Constraints within CREATE TABLE in Oracle 12c

You can use the CREATE TABLE statement to enforce several different kinds of constraints on a table: candidate keys, primary keys, ...

#86. How to Create Composite Primary Key in MySQL - Ubiq BI

You can create composite primary key, either during table creation using CREATE TABLE statement, or after creating tables using ALTER TABLE ...

#87. Primary Key in SQL - Edureka

Primary Key Operations: Primary Key on Create Table; Primary Key on Alter Table; Drop Primary Key. What is a Primary ...

#88. Create jobs table with Primary Key Constraint - itversity

Let us understand how to create tables like jobs with Primary Key Constraint on column job_id. It is surrogate key and can be populated ...

#89. SQL Create Table Statement - DB2 Tutorial - IBMMainframer

PRIMARY KEY constraint: · The PRIMARY KEY ensures all values in the column/columns are unique. · The clause must not be specified more than once and the ...

#90. Primary Key constraint of MySQL table - Plus2net

One table can have one Primary Key constrain and this is used to uniquely identify the row. Primary Key can't have Null data. Creating and deleting Primary Key ...

#91. How to create primary key while creating table usi... - SAS ...

You can apply primary keys when creating a new empty table. Then you would insert data into that table: proc sql; create table abc (...) ...

#92. CREATE TABLE Statement - Apache Impala

[PRIMARY KEY ( col_name [, ...])] ) [PARTITION BY kudu_partition_clause ] [COMMENT ' table_comment '] STORED AS KUDU [TBLPROPERTIES ('external.table.purge'=' ...

#93. CREATE TABLE — CUBRID 10.0.0 documentation

Available constraints are NOT NULL, UNIQUE, PRIMARY KEY and FOREIGN KEY. For details, see Constraint Definition. <default_or_shared_or_ai>: only one of DEFAULT, ...

#94. CREATE TABLE - SQLite - W3cubDocs

A table created using CREATE TABLE AS has no PRIMARY KEY and no constraints of any kind. The default value of each column is NULL. The ...

#95. All SQL Constraints - NOT NULL, UNIQUE, CHECK etc

Usually Primary Key is used to index the data inside the table. PRIMARY KEY constraint at Table Level. CREATE table Student ( s_id int ...

#96. SQL Primary Key Constraint - Tutorial Gateway

Let us see how to create a Primary Key using a transact query. Here we will define it at the creation of the table. CREATE TABLE [CustmerRecords] ( [CustomerKey] ...