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08799831cc
Now when sql_mode=ORACLE, the concatenation operator || treats NULLs as empty strings. Based on the contributed patch from Jérôme Brauge.
84 lines
2.3 KiB
Plaintext
84 lines
2.3 KiB
Plaintext
#
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# Testing CONCAT with null values
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#
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SET sql_mode=ORACLE;
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EXPLAIN EXTENDED SELECT 'a'||'b'||'c';
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SELECT '' || '';
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SELECT '' || 'b';
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SELECT '' || NULL;
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SELECT 'a' || '';
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SELECT 'a' || 'b';
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SELECT 'a' || NULL;
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SELECT NULL || '';
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SELECT NULL || 'b';
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SELECT NULL || NULL;
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SELECT '' || '' || '';
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SELECT '' || '' || 'c';
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SELECT '' || '' || NULL;
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SELECT '' || 'b' || '';
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SELECT '' || 'b' || 'c';
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SELECT '' || 'b' || NULL;
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SELECT '' || NULL || '';
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SELECT '' || NULL || 'c';
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SELECT '' || NULL || NULL;
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SELECT 'a' || '' || '';
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SELECT 'a' || '' || 'c';
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SELECT 'a' || '' || NULL;
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SELECT 'a' || 'b' || '';
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SELECT 'a' || 'b' || 'c';
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SELECT 'a' || 'b' || NULL;
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SELECT 'a' || NULL || '';
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SELECT 'a' || NULL || 'c';
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SELECT 'a' || NULL || NULL;
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SELECT NULL || '' || '';
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SELECT NULL || '' || 'c';
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SELECT NULL || '' || NULL;
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SELECT NULL || 'b' || '';
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SELECT NULL || 'b' || 'c';
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SELECT NULL || 'b' || NULL;
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SELECT NULL || NULL || '';
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SELECT NULL || NULL || 'c';
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SELECT NULL || NULL || NULL;
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CREATE TABLE t1 (a VARCHAR(10), b VARCHAR(10), c VARCHAR(10));
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INSERT INTO t1 VALUES ('', '', '');
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INSERT INTO t1 VALUES ('', '', 'c');
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INSERT INTO t1 VALUES ('', '', NULL);
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INSERT INTO t1 VALUES ('', 'b', '');
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INSERT INTO t1 VALUES ('', 'b', 'c');
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INSERT INTO t1 VALUES ('', 'b', NULL);
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INSERT INTO t1 VALUES ('', NULL, '');
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INSERT INTO t1 VALUES ('', NULL, 'c');
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INSERT INTO t1 VALUES ('', NULL, NULL);
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INSERT INTO t1 VALUES ('a', '', '');
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INSERT INTO t1 VALUES ('a', '', 'c');
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INSERT INTO t1 VALUES ('a', '', NULL);
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INSERT INTO t1 VALUES ('a', 'b', '');
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INSERT INTO t1 VALUES ('a', 'b', 'c');
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INSERT INTO t1 VALUES ('a', 'b', NULL);
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INSERT INTO t1 VALUES ('a', NULL, '');
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INSERT INTO t1 VALUES ('a', NULL, 'c');
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INSERT INTO t1 VALUES ('a', NULL, NULL);
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INSERT INTO t1 VALUES (NULL, '', '');
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INSERT INTO t1 VALUES (NULL, '', 'c');
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INSERT INTO t1 VALUES (NULL, '', NULL);
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INSERT INTO t1 VALUES (NULL, 'b', '');
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INSERT INTO t1 VALUES (NULL, 'b', 'c');
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INSERT INTO t1 VALUES (NULL, 'b', NULL);
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INSERT INTO t1 VALUES (NULL, NULL, '');
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INSERT INTO t1 VALUES (NULL, NULL, 'c');
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INSERT INTO t1 VALUES (NULL, NULL, NULL);
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SELECT LENGTH(a||b||c), a||b||c FROM t1 ORDER BY a,b,c;
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DROP TABLE t1;
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