SQLTableTypeNamesSQLTableTypeNames[conn] returns the types of table supported in an SQL connection.更多信息和选项 范例打开所有单元 基本范例(1) In[1]:= If you find that the examples in this section do not work as shown, you may need to install or restore the example database with th...
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...
CREATETABLEtable_name ( column1_name datatype1, column2_name datatype2, column3_name datatype3, ... ); Here, column1_name,column2_name,column3_name,...are the names of the columns datatype1,datatype2,datatype3,...are the data types such asINTEGER,TEXT, etc. to be stored in ...
To check if a table exists before creating it, you can enclose the CREATE TABLE statement inside an IF statement. IFNOTEXISTS(SELECT*FROMsys.tablestINNERJOINsys.schemas sONt.schema_id=s.schema_idWHEREs.name='my_schema_name'ANDt.name='table_name')CREATETABLEtable_name(column_name data_type)...
CREATETABLE[IFNOTEXISTS] [Database_name].[Schema_name].table_name ( Column_name datatype [UNIQUE[KEY]|[[PRIMARY] KEY]|CONSTRAINT(NOTNULL|NULL, VISIBLE|INVISIBLE|DEFAULT|CHECK], Column_name datatype [UNIQUE[KEY]|[[PRIMARY] KEY]|CONSTRAINT(NOTNULL|NULL, VISIBLE|INVISIBLE|DEFAULT|CHECK], …...
Use the ALTER TABLE statement to alter the definition of a nonpartitioned table, a partitioned table, a table partition, or a table subpartition. For object tables or relational tables with object columns, use ALTER TABLE to convert the table to the latest definition of its referenced type ...
-- 1. 创建UDF CREATE FUNCTION user_scalar_func AS 'flink.examples.sql._12_data_type._02_user_defined.UserScalarFunction'; -- 2. 创建数据源表 CREATE TABLE source_table ( user_id BIGINT NOT NULL COMMENT '用户 id' ) WITH ( 'connector' = 'datagen', 'rows-per-second' = '1', 'fiel...
Examples Prerequisites To create a relational table in your own schema, you must have the CREATE TABLE system privilege. To create a table in another user's schema, you must have CREATE ANY TABLE system privilege. Also, the owner of the schema to contain the table must have either space qu...
Before going to detailed examples of left join I would like to give you idea about left join. When user wants to retrieve all the records from left table and common records from both table together then left join is used. Syntax :
Examples A. Declare a variable of type table The following example creates a table variable that stores the values specified in the OUTPUT clause of the UPDATE statement. Two SELECT statements follow, which return the values in @MyTableVar and the results of the update operation in the Employee...