SAP HANA Developer Guide - Get a Free Blog

freestyler to the additional hidden TEXT column. In this case, the mode textsearch=compare and all fuzzy search
options are allowed:
CREATE COLUMN TABLE mytable
(
col1 SHORTTEXT(200)
);
SELECT score() AS score, * FROM mytable WHERE contains(col1, 'a b',
fuzzy(0.8, 'textsearch=compare'));
Fuzzy Search on a FULLTEXT INDEX
When a full text index is created on a column that is not of type TEXT (e.g. NVARCHAR, NCLOB, ...) a hidden text
column is added to the table. A call to contains that references the non-TEXT column is automatically redirected
by the freestyler to the additional text column. In this case, the mode textsearch=compare and all fuzzy search
options are allowed:
CREATE COLUMN TABLE mytable
(
col1 NVARCHAR(2000)
);
CREATE FULLTEXT INDEX myindex ON mytable(col1);
SELECT score() AS score, * FROM mytable WHERE contains(col1, 'a b',
fuzzy(0.8, 'textsearch=compare'));
Merge Delta for Better Performance
When inserting or loading a large number of rows in a table that has a TEXT or SHORTTEXT column or that uses a
FULLTEXT INDEX, it is important to merge the delta part of the table to get a good search performance.
A delta merge can be started manually with the following SQL statement:
MERGE DELTA OF mytable;
Alternatively, a delta merge can be triggered automatically by the mergedog process.
Fuzzy Multi-Token Search on Text Columns
Content Types
When using more than one token within a query, the default content type is AND (for example, ... WHERE
CONTAINS (mycolumn, 'software firm', FUZZY(0.5)) ... will return entries that contain a token similar to 'software'
and a token similar to 'firm').
Alternatively, you can use OR by adding the key word between the tokens (for example, ... WHERE CONTAINS
(mycolumn, 'apple OR 'banana', FUZZY(0.5)) ... will return entries that contain a token similar to 'apple' and
entries that contain a token similar to 'banana').
282
P U B L I C
© 2012 SAP AG. All rights reserved.
SAP HANA Developer Guide
Enabling Search