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doc-exports/docs/dws/tool/dws_16_0047.html
luhuayi a5e3903f6b DWS TG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-04-23 13:53:01 +00:00

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Comparison and List Operators

The following comparison and list operators are supported:

The comparison operators LT, LE, GT, GE, EQ, and NE must not be used as TABLE alias or COLUMN alias.

^= and GT

Input: Comparison operations (^= and GT)
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SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 ^= t1.c3
   AND t2.c4 GT 100;

Output:

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SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 <> t1.c3
   AND t2.c4 > 100;

EQ and NE

Input: Comparison operations (EQ and NE)
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SELECT t1.c1, t2.c2 
  FROM tab1 t1 INNER JOIN tab2 t2 
    ON t1.c2 EQ t2.c2
 WHERE t1.c6 NE 1000;

Output:

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 SELECT t1.c1, t2.c2 
  FROM tab1 t1 INNER JOIN tab2 t2 
    ON t1.c2 = t2.c2
 WHERE
        t1.c6 <> 1000;

LE and GE

Input: Comparison operations (LE and GE)
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SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 LE 200
   AND t2.c4 GE 100;

Output:

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 SELECT t1.c1, t2.c2 
   FROM tab1 t1, tab2 t2 
  WHERE t1.c3 <= 200
    AND t2.c4 >= 100;

NOT= and LT

Input: Comparison operations (NOT= and LT)
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SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 NOT= t1.c3
   AND t2.c4 LT 100;

Output:

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SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 <> t1.c3
   AND t2.c4 < 100;

IN and NOT IN

For details, see IN and NOT IN Conversion.

Input: IN and NOT IN
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 SELECT c1, c2
   FROM tab1
  WHERE c1 IN 'XY';

Output:

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SELECT c1, c2
  FROM tab1
 WHERE c1 = 'XY';

GaussDB(DWS) does not support IN and NOT IN operators in some specific scenarios.

IS NOT IN

Input: IS NOT IN
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SELECT c1, c2
  FROM tab1
 WHERE c1 IS NOT IN (subquery);

Output:

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SELECT c1, c2
  FROM tab1
 WHERE c1 NOT IN (subquery);

LIKE ALL/NOT LIKE ALL

Input: LIKE ALL / NOT LIKE ALL
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SELECT c1, c2
  FROM tab1
 WHERE c3 NOT LIKE ALL ('%STR1%', '%STR2%', '%STR3%');

Output:

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SELECT c1, c2
  FROM tab1
 WHERE c3 NOT LIKE ALL (ARRAY[ '%STR1%', '%STR2%', '%STR3%' ]);

LIKE ANY/NOT LIKE ANY

Input: LIKE ANY / NOT LIKE ANY
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SELECT c1, c2
  FROM tab1
 WHERE c3 LIKE ANY ('STR1%', 'STR2%', 'STR3%');

Output:

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SELECT c1, c2
  FROM tab1
 WHERE c3 LIKE ANY (ARRAY[ 'STR1%', 'STR2%', 'STR3%' ]);
Parent topic: Functions and Operators