SAP HANA Advanced Modeling- SAP HANA Online Course 1. Joins – Different Types of Joins in SAP HANA. A Join clause combines records from two or more tables /view in a database. SAP HANA supports following types of join. Inner Join• Left Outer Join• Right Outer Join• Full Outer Join• Referential Join• Text Join. In this chapter you will learn the details of all these type of joins. We are going to use 2 tables to explain the different types of Join. CUSTOMER and SALES_ORDER. SQL Script to create the above mentioned tables. REPLACE WITH YOUR SCHEMA. CREATE COLUMN TABLE < Schema_Name>."CUSTOMER" (. Customer. ID" nvarchar(1. Customer. Name" nvarchar(5. INSERT INTO < Schema_Name>."CUSTOMER" VALUES ('C1', 'Alfred'). INSERT INTO < Schema_Name>."CUSTOMER" VALUES ('C2', 'John'). INSERT INTO < Schema_Name>."CUSTOMER" VALUES ('C3', 'Maria'). INSERT INTO < Schema_Name>."CUSTOMER" VALUES ('C4', 'Harry'). CREATE COLUMN TABLE < Schema_Name>."SALES_ORDER" (. Order. ID" integer primary key. Customer. ID" nvarchar(1. Product" nvarchar(2. Total_Units" integer. INSERT INTO < Schema_Name>."SALES_ORDER" VALUES (1. C1','Camera',3. 00). INSERT INTO < Schema_Name>."SALES_ORDER" VALUES (1.
Sap Error Select One Of The Installed Languages Of BelgiumC1','Mobile',2. 00). INSERT INTO < Schema_Name>."SALES_ORDER" VALUES (1. C2','i. Pod',5. 00). INSERT INTO < Schema_Name>."SALES_ORDER" VALUES (1. This definition explains the meaning of Perl and how this family of open source, interpreted programming languages is used. Huawei Technologies Co. Ltd. (/ ˈ h w ɑː ˌ w eɪ /; pinyin: Huáwéi) is a Chinese multinational networking and telecommunications equipment and services company. C3','Television',4. INSERT INTO < Schema_Name>."SALES_ORDER" VALUES (1. C5','Laptop',8. 00). The INNER JOIN selects the set of records that match in both the Tables. SELECT T2."Order. ID", T1."Customer. ID", T1."Customer. Name", T2."Product", T2."Total_Units". CUSTOMER" AS T1. "SALES_ORDER" AS T2. ON T1."Customer. ID" = T2."Customer. ID". The result of Inner Join will be like this. Left Outer Join. The Left Outer Join selects the complete set of records from first table (CUSTOMER), with the matching records (where available) in second table (SALES_ORDER). If there is no match, the right side will contain null. SELECT T2."Order. ID", T1."Customer. ID", T1."Customer. Name", T2."Product", T2."Total_Units". CUSTOMER" AS T1. LEFT OUTER JOIN. SALES_ORDER" AS T2. ON T1."Customer. ID" = T2."Customer. ID". The result of Left Outer Join will be like this. Right Outer Join. The Right Outer Join selects the complete set of records from second table (SALES_ORDER), with the matching records (where available) in first table (CUSTOMER). If there is no match, the left side will contain null. SELECT T2."Order. ID", T2."Customer. ID", T1."Customer. Name", T2."Product", T2."Total_Units". CUSTOMER" AS T1. RIGHT OUTER JOIN. SALES_ORDER" AS T2. ON T1."Customer. ID" = T2."Customer. ID". The result of Right Outer Join will be like this. Full Outer Join. The INNER JOIN selects the set of records that match in both the Tables. SELECT T2."Order. ID", T1."Customer.ID", T1."Customer.Name", T2."Product", T2."Total_Units". more. CUSTOMER" AS T1. FULL OUTER JOIN.SALES_ORDER" AS T2. ON T1."Customer. ID" = T2."Customer. ID". The result of Full Outer Join will be like this. All the 4 types of joins explained above are standard database join types. SAP HANA also supports 2 new type of joins. Referential Join and Text Join. These 2 type of joins can only be used in modeling views. Let's take a look into these 2 new type of joins. SAP HANA Referential Join. Referential Join is semantically an inner join that assume that referential integrity is given. . Referential integrity is the property of database which ensures that each foreign key value in a table exists as a primary key in the referenced table.Referential join is performance wise better than inner join, but only be used when you are sure that referential integrity is maintained. SAP HANA Text Join. Text Join is used in order to get language- specific data. You have a product table that contains product IDs without descriptions and you have a text table for products that contains language- specific descriptions for each product. You can create a text join between the two tables to get the language- specific details. In a text join, the right table should be the text table and it is mandatory to specify the Language Column. In the next chapter we will learn more about Text join.
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