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build/lib/mysql/mysql-test/t/case.test
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172
build/lib/mysql/mysql-test/t/case.test
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# Testing of CASE
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#
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--disable_warnings
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drop table if exists t1, t2;
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--enable_warnings
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select CASE "b" when "a" then 1 when "b" then 2 END;
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select CASE "c" when "a" then 1 when "b" then 2 END;
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select CASE "c" when "a" then 1 when "b" then 2 ELSE 3 END;
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select CASE BINARY "b" when "a" then 1 when "B" then 2 WHEN "b" then "ok" END;
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select CASE "b" when "a" then 1 when binary "B" then 2 WHEN "b" then "ok" END;
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select CASE concat("a","b") when concat("ab","") then "a" when "b" then "b" end;
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select CASE when 1=0 then "true" else "false" END;
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select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
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explain extended select CASE 1 when 1 then "one" WHEN 2 then "two" ELSE "more" END;
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select CASE 2.0 when 1 then "one" WHEN 2.0 then "two" ELSE "more" END;
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select (CASE "two" when "one" then "1" WHEN "two" then "2" END) | 0;
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select (CASE "two" when "one" then 1.00 WHEN "two" then 2.00 END) +0.0;
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select case 1/0 when "a" then "true" else "false" END;
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select case 1/0 when "a" then "true" END;
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select (case 1/0 when "a" then "true" END) | 0;
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select (case 1/0 when "a" then "true" END) + 0.0;
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select case when 1>0 then "TRUE" else "FALSE" END;
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select case when 1<0 then "TRUE" else "FALSE" END;
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#
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# Test bug when using GROUP BY on CASE
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#
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create table t1 (a int);
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insert into t1 values(1),(2),(3),(4);
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select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
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explain extended select case a when 1 then 2 when 2 then 3 else 0 end as fcase, count(*) from t1 group by fcase;
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select case a when 1 then "one" when 2 then "two" else "nothing" end as fcase, count(*) from t1 group by fcase;
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drop table t1;
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#
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# Test MAX(CASE ... ) that can return null
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#
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create table t1 (row int not null, col int not null, val varchar(255) not null);
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insert into t1 values (1,1,'orange'),(1,2,'large'),(2,1,'yellow'),(2,2,'medium'),(3,1,'green'),(3,2,'small');
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select max(case col when 1 then val else null end) as color from t1 group by row;
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drop table t1;
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SET NAMES latin1;
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#
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# CASE and argument types/collations aggregation into result
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#
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CREATE TABLE t1 SELECT
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CASE WHEN 1 THEN _latin1'a' COLLATE latin1_danish_ci ELSE _latin1'a' END AS c1,
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CASE WHEN 1 THEN _latin1'a' ELSE _latin1'a' COLLATE latin1_danish_ci END AS c2,
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CASE WHEN 1 THEN 'a' ELSE 1 END AS c3,
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CASE WHEN 1 THEN 1 ELSE 'a' END AS c4,
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CASE WHEN 1 THEN 'a' ELSE 1.0 END AS c5,
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CASE WHEN 1 THEN 1.0 ELSE 'a' END AS c6,
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CASE WHEN 1 THEN 1 ELSE 1.0 END AS c7,
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CASE WHEN 1 THEN 1.0 ELSE 1 END AS c8,
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CASE WHEN 1 THEN 1.0 END AS c9,
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CASE WHEN 1 THEN 0.1e1 else 0.1 END AS c10,
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CASE WHEN 1 THEN 0.1e1 else 1 END AS c11,
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CASE WHEN 1 THEN 0.1e1 else '1' END AS c12
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;
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SHOW CREATE TABLE t1;
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DROP TABLE t1;
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--error 1267
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SELECT CASE
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WHEN 1
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THEN _latin1'a' COLLATE latin1_danish_ci
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ELSE _latin1'a' COLLATE latin1_swedish_ci
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END;
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--error 1270
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SELECT CASE _latin1'a' COLLATE latin1_general_ci
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WHEN _latin1'a' COLLATE latin1_danish_ci THEN 1
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WHEN _latin1'a' COLLATE latin1_swedish_ci THEN 2
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END;
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SELECT
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CASE _latin1'a' COLLATE latin1_general_ci WHEN _latin1'A' THEN '1' ELSE 2 END,
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CASE _latin1'a' COLLATE latin1_bin WHEN _latin1'A' THEN '1' ELSE 2 END,
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CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_swedish_ci THEN '1' ELSE 2 END,
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CASE _latin1'a' WHEN _latin1'A' COLLATE latin1_bin THEN '1' ELSE 2 END
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;
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#
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# COALESCE is a CASE abbrevation:
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#
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# COALESCE(v1,v2) == CASE WHEN v1 IS NOT NULL THEN v1 ELSE v2 END
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#
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# COALESCE(V1, V2, . . . ,Vn ) =
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# CASE WHEN V1 IS NOT NULL THEN V1 ELSE COALESCE (V2, . . . ,Vn) END
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#
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# Check COALESCE argument types aggregation
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--error 1267
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CREATE TABLE t1 SELECT COALESCE(_latin1'a',_latin2'a');
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--error 1267
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CREATE TABLE t1 SELECT COALESCE('a' COLLATE latin1_swedish_ci,'b' COLLATE latin1_bin);
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CREATE TABLE t1 SELECT
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COALESCE(1), COALESCE(1.0),COALESCE('a'),
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COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
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COALESCE('a' COLLATE latin1_bin,'b');
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explain extended SELECT
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COALESCE(1), COALESCE(1.0),COALESCE('a'),
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COALESCE(1,1.0), COALESCE(1,'1'),COALESCE(1.1,'1'),
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COALESCE('a' COLLATE latin1_bin,'b');
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SHOW CREATE TABLE t1;
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DROP TABLE t1;
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# Test for BUG#10151
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SELECT 'case+union+test'
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UNION
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SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
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SELECT CASE LOWER('1') WHEN LOWER('2') THEN 'BUG' ELSE 'nobug' END;
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SELECT 'case+union+test'
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UNION
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SELECT CASE '1' WHEN '2' THEN 'BUG' ELSE 'nobug' END;
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#
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# Bug #17896: problem with MIN(CASE...)
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#
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create table t1(a float, b int default 3);
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insert into t1 (a) values (2), (11), (8);
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select min(a), min(case when 1=1 then a else NULL end),
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min(case when 1!=1 then NULL else a end)
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from t1 where b=3 group by b;
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drop table t1;
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#
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# Tests for bug #9939: conversion of the arguments for COALESCE and IFNULL
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#
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CREATE TABLE t1 (EMPNUM INT);
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INSERT INTO t1 VALUES (0), (2);
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CREATE TABLE t2 (EMPNUM DECIMAL (4, 2));
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INSERT INTO t2 VALUES (0.0), (9.0);
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SELECT COALESCE(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
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t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
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FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;
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SELECT IFNULL(t2.EMPNUM,t1.EMPNUM) AS CEMPNUM,
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t1.EMPNUM AS EMPMUM1, t2.EMPNUM AS EMPNUM2
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FROM t1 LEFT JOIN t2 ON t1.EMPNUM=t2.EMPNUM;
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DROP TABLE t1,t2;
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--echo End of 4.1 tests
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#
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# #30782: Truncated UNSIGNED BIGINT columns
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#
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create table t1 (a int, b bigint unsigned);
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create table t2 (c int);
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insert into t1 (a, b) values (1,4572794622775114594), (2,18196094287899841997),
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(3,11120436154190595086);
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insert into t2 (c) values (1), (2), (3);
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select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1
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join t2 on t1.a=t2.c order by d;
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select t1.a, (case t1.a when 0 then 0 else t1.b end) d from t1
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join t2 on t1.a=t2.c where b=11120436154190595086 order by d;
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drop table t1, t2;
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--echo End of 5.0 tests
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