Join using CE functions in SAP HANA database

You can try using projection node as follows to perform joins in SAP HANA using CE functions. The CE_PROJECTION function allows you to select specific columns and rename them, while CE_JOIN performs the actual join operation between tables.

Example

Here's how to join two tables using CE functions with column projection and renaming ?

table1 = CE_PROJECTION(:T1,["ACCT_ID","SALARY"]);
table2 = CE_PROJECTION(:T2,["EMPL_ID" AS "ACCT_ID","ADD","ZIP","STATE"]);
var_out = CE_JOIN(:table1,:table2,["ACCT_ID"]);

Using Projection node, you can rename the column names. Note that EMPL_ID has been renamed to ACCT_ID in the second projection to create a common join key between the two tables.

In this example:

• table1 projects columns ACCT_ID and SALARY from table T1
• table2 projects columns from T2, renaming EMPL_ID to ACCT_ID for the join
• CE_JOIN performs an inner join on the common ACCT_ID column

Conclusion

CE functions in SAP HANA provide a powerful way to perform table joins with column projection and renaming capabilities. This approach allows you to create flexible data retrieval operations by combining multiple tables based on common keys.