![]() We can create a temporary table in redshift by simply prefixing the name of the table in create table command with a keyword temp. You can specify the names of columns and also what type of values will be stored in it inside the parenthesis. The name of the table can be any valid table name which you want your temporary table to be called. The use of hash symbol for creating a temporary table can be done by using the below syntax –ĬREATE TABLE #name of the table (name of the columns along with their data types) The syntax of all the three methods is as given below – This are the use of hash symbol (#) before the name of the temporary table, specifying the keyword TEMP before the name of the table, and specifying the TEMPORARY keyword before the name of the table. Only table structure is created.There are three ways by using which we can create a temp table in redshift. You have to specify the DISTSTYLE, DISTKEY and SORTKEY while using CTAS Inherits table settings such as DISTSTYLE, DISTKEY, SORTKEY and NOT NULL Settings Difference Between Redshift CREATE TABLE LIKE and CREATE TABLE AS (CTAS)įollowing table provide the simple difference between CREATE TABLE LIKE and CREATE TABLE AS (CTAS) CREATE TABLE LIKE However, it does not copy the data into a new table. CREATE TABLE RedshiftTestTable_bkp (LIKE RedshiftTestTable) ĬREATE TABLE LIKE method creates the structure by copying settings from the parent table. The following statement creates a “RedshiftTestTable_bkp” table by copying settings from the exiting “RedshiftTestTable” table. The CREATE TABLE LIKE method creates a new table by inheriting the encoding, distkey, sortkey, and not null attributes of the parent table. CREATE TABLE LIKE Method to Create Redshift Table Note that, you cannot specify the DISTSTYLE, DISTKEY and SORTKEY while using SELECT INTO. SELECT INTO facilitates fast bulk data copy to a new tables from a query.įollowing statement uses SELECT INTO to create a new table RedshiftTestTable3 in Amazon Redshift. The same method is available in SQL server to create table out of the query. ![]() SELECT INTO is another way to create new tables. ) Use SELECT INTO to Create Redshift Table However, DISTSTYLE EVEN/ALL/NONE is not compatible with a DISTKEY. You can also specify the DISTSTYLE, DISTKEY and SORTKEY while using CTAS. ![]() Redshift CREATE TABLE AS (CTAS) with DISTSTYLE, DISTKEY and SORTKEY The table columns have names and data types associated with the output columns of the query. The new table is loaded with data defined by the query in the command. The following statement can create table in Redshift using CTAS. This method is usually used to create table with data. SORTKEY (id) CREATE TABLE AS Method to Create Redshift TableĬREATE TABLE AS (CTAS) is another common method to creates a new table based on a query. Typically, DDL in Redshift looks something like following example. Using table DDL is the most common method to create tables in Amazon Redshift.
0 Comments
Leave a Reply. |