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

The following comparison and list operators are supported:

Input: Comparison operations (^= and GT)

SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 ^= t1.c3
   AND t2.c4 GT 100;

Output

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

Input: Comparison operations (EQ and NE)

SELECT t1.c1, t2.c2 
  FROM tab1 t1 INNER JOIN tab2 t2 
    ON t1.c2 EQ t2.c2
 WHERE t1.c6 NE 1000;

Output

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

Input: Comparison operations (LE and GE)

SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 LE 200
   AND t2.c4 GE 100;

Output

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

Input: Comparison operations (NOT= and LT)

SELECT t1.c1, t2.c2 
  FROM tab1 t1, tab2 t2 
 WHERE t1.c3 NOT= t1.c3
   AND t2.c4 LT 100;

Output

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

For details, see IN and NOT IN Conversion.

Input: IN and NOT IN

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

Output

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

GaussDB A and GaussDB(DWS) support the IN and NOT IN operators, except in special scenarios.

Input: IS NOT IN

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

Output

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

Input: LIKE ALL / NOT LIKE ALL

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

Output

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

Input: LIKE ANY / NOT LIKE ANY

SELECT c1, c2
  FROM tab1
 WHERE c3 LIKE ANY ('STR1%', 'STR2%', 'STR3%');

Output

SELECT c1, c2
  FROM tab1
 WHERE c3 LIKE ANY (ARRAY[ 'STR1%', 'STR2%', 'STR3%' ]);

Comparison and List Operators