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240
INSERT INTO t1 (a, b) VALUES (0, 0);
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241
CREATE TABLE t2 SELECT IFNULL(a, b) FROM t1;
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IFNULL(a, b) DECIMAL TRUE TRUE
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246
CREATE TABLE t2 SELECT IFNULL(a, NULL) FROM t1;
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249
IFNULL(a, NULL) DECIMAL TRUE TRUE
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251
CREATE TABLE t2 SELECT IFNULL(NULL, b) FROM t1;
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254
IFNULL(NULL, b) DECIMAL TRUE TRUE