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
SQL CREATEEXTERNALDATASOURCEmydatasourceWITH(TYPE= HADOOP, LOCATION ='hdfs://xxx.xxx.xxx.xxx:8020')CREATEEXTERNALFILEFORMATmyfileformatWITH( FORMAT_TYPE = DELIMITEDTEXT, FORMAT_OPTIONS (FIELD_TERMINATOR ='|') );CREATEEXTERNALTABLEClickStream (urlvarchar(50), event_datedate, user_IPvarchar(50) )...
[, ... ])| LIKE source_table [ like_option [...] ] } [ WITH ( {storage_parameter = value} [, ... ] ) ] [ ON COMMIT { PRESERVE ROWS | DELETE ROWS } ] [ COMPRESS | NOCOMPRESS ] [ DISTRIBUTE BY { REPLICATION | ROUNDROBIN | { HASH ( column_name [,...] ) } } ] [...
] referenced_table_name [ ( ref_column ) ] | CHECK ( logical_expression ) } <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } { NONCLUSTERED ( column_name [ ASC | DESC ] [ ,... n ]) | NONCLUSTERED HASH ( column_name [ ,... n ] ) WITH ...
The following SQL script creates the Employee table in Oracle Database with a primary key: SQL Script: Create Table in Oracle Copy CREATE TABLE Employee( EmpId number PRIMARY KEY, FirstName varchar2(20), LastName varchar2(20), Email varchar2(25), PhoneNo varchar2(25), Salary number(8) ...
[ WITH ( <table_option> [ ,... n ] ) ] [ ; ] <column_definition> ::= column_name <data_type> [ FILESTREAM ] [ COLLATE collation_name ] [ SPARSE ] [ MASKED WITH ( FUNCTION = 'mask_function' ) ] [ [ CONSTRAINT constraint_name ] DEFAULT constant_expression ] [ IDENTITY [ (...
If you create a new table using an existing table, the new table will be filled with the existing values from the old table. Syntax CREATETABLEnew_table_nameAS SELECTcolumn1, column2,... FROMexisting_table_name WHERE...; The following SQL creates a new table called "TestTable" (which...
Create Table 创建表 CREATE [TEMPORARY] [EXTERNAL] TABLE [IF NOT EXISTS] [db_name.]table_name -- (Note: TEMPORARY available in Hive 0.14.0 and later) [(col_name data_type [COMMENT col_comment], ... [constraint_specification])]
CREATE TABLE Employees ( EmployeeID INT PRIMARY KEY, FirstName VARCHAR(50), LastName VARCHAR(50), BirthDate DATE, HireDate DATE, Salary DECIMAL(10, 2) ); 这段SQL代码创建了一个名为Employees的表,包含EmployeeID、FirstName、LastName、BirthDate、HireDate和Salary六个列,并定义了EmployeeID为主键。
LIKE source_table [ like_option ... ] LIKE子句声明一个表,新表自动从声明的表中继承所有字段名及其数据类型和非空约束。 使用约束参见LIKE参数使用说明。 WITH 这个子句为表或索引指定一个可选的存储参数。 支持的WITH参数参见表5-201。 COMPRESS / NOCOMPRESS 创建一个新表时,需要在创建表语句中指定关...