Here, the SQL command checks if a table namedCompaniesexists, and if not, it creates a table with specified columns. Create Table Using Another Existing Table In SQL, we can create a new table by duplicating an existing table's structure. Let's look at an example. -- create a backup t...
CREATE TABLE costlist( id int not null auto_increment primary key, inputtime TIMESTAMP, name varchar( 6 ) , sum DECIMAL( 4, 1 ) default '0' , cost DECIMAL(4,1) default '0', balance DECIMAL( 4, 1 ) default '0', information TEXT, flag varchar(1) ) 2. create table user( id ...
Then, give the primary key a name. You only need to do this for out of line constraints. In this example, I’ve given it the name of “pk_tbl1”, to indicate that it is a primary key, and the “tbl1” would be the name of the table. Inside the brackets after the word PRIMAR...
SQL CREATE TABLE Example The following example creates a table called "Persons" that contains five columns: PersonID, LastName, FirstName, Address, and City: ExampleGet your own SQL Server CREATETABLEPersons ( PersonID int, LastName varchar(255), ...
For Example: If you want to create the employee table, the statement would be like,CREATE TABLE employee ( id number(5), name char(20), dept char(10), age number(2), salary number(10), location char(10) ); In Oracle database, the datatype for an integer column is ...
For an example of creating a new SQL table from an existing one, suppose we want to extract a female patient table and store it in a new table calledfemale_patient. Two ways to write this SQL query: sql sql CREATETABLEfemale_patientAS(SELECTpatient_id,patient_name,age,gender,address,disea...
在 MySQL 中,可以使用以下 SQL 语句创建一个包含 MEDIUMINT 类型字段的表: CREATE TABLE example_table ( id INT PRIMARY KEY, medium_number MEDIUMINT ); 在上述代码中,example_table表包含 id 和 medium_number 两个字段,其中 medium_number 的数据类型为 MEDIUMINT。
'''cursor.execute(create_table_query) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 这个SQL语句中,我们使用了CREATE TABLE语句来创建一个名为’example_table’的表格。表格中包含三个字段:'id’是自增的主键,'name’是一个长度为100的字符串字段,'text_field’是一个TEXT类型的字段。
例(选用example数据库) 2)查看已选择的数据库中所有数据表 基本语法:SHOW TABLES; 例(查看test1数据库中数据表) 3)删除数据库 基本语法:DROP DATABASE dbname; 例(删除test1数据库) (二)数据表操作 1.创建表 基本语法: CREATE TABLE tablename(
If a table or other object of the given name already exists in the specified database and schema context or the user has no permissions to create a table, an error is raised. IF NOT EXISTS If the optionalIF NOT EXISTSis specified, then the statement creates the table if it does not al...