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************************************************************ * Creating table with char+binary types ************************************************************ CREATE TABLE t3( c1 char(32), b1 binary(32) ) ENGINE=NDB; INSERT INTO t3 VALUES('aaaaaaaa', 'bbbbbbbb'); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 32 ************************************************************ * Backing up table with char+binary types ************************************************************ ************************************************************ * Restoring table with unchanged char+binary types (sanity check): * char(32) --> char(32) * binary(32) --> binary(32) ************************************************************ CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 32 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with promoted char+binary types preserving padding: * char(32) --> varchar(32) * binary(32) --> varbinary(32) ************************************************************ ALTER TABLE t3 MODIFY c1 varchar(32), MODIFY b1 varbinary(32); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 32 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 32 32 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with promoted char+binary types preserving padding: * char(32) --> varchar(64) * binary(32) --> varbinary(64) ************************************************************ ALTER TABLE t3 MODIFY c1 varchar(64), MODIFY b1 varbinary(64); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 32 32 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 32 32 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with promoted char+binary types preserving padding: * char(32) --> varchar(512) * binary(32) --> varbinary(512) ************************************************************ ALTER TABLE t3 MODIFY c1 varchar(512), MODIFY b1 varbinary(512); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 32 32 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 32 32 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with demoted char+binary types preserving padding: * char(32) --> varchar(16) * binary(32) --> varbinary(16) ************************************************************ ALTER TABLE t3 MODIFY c1 varchar(16), MODIFY b1 varbinary(16); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 16 16 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 16 16 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with promoted char+binary types discarding padding: * char(32) --> varchar(32) * binary(32) --> varbinary(32) ************************************************************ DELETE FROM t3; ALTER TABLE t3 MODIFY c1 varchar(32), MODIFY b1 varbinary(32); INSERT INTO t3 VALUES('aaaaaaaa', 'bbbbbbbb'); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with promoted char+binary types discarding padding: * char(32) --> varchar(64) * binary(32) --> varbinary(64) ************************************************************ ALTER TABLE t3 MODIFY c1 varchar(64), MODIFY b1 varbinary(64); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with promoted char+binary types discarding padding: * char(32) --> varchar(512) * binary(32) --> varbinary(512) ************************************************************ ALTER TABLE t3 MODIFY c1 varchar(512), MODIFY b1 varbinary(512); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Restoring table with demoted char+binary types discarding padding: * char(32) --> varchar(16) * binary(32) --> varbinary(16) ************************************************************ ALTER TABLE t3 MODIFY c1 varchar(16), MODIFY b1 varbinary(16); SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 CREATE TABLE t3_myisam ENGINE=MYISAM AS SELECT * FROM t3; DELETE FROM t3; SELECT length(c1), length(b1) FROM t3; length(c1) length(b1) 8 8 SELECT COUNT(*) FROM t3 NATURAL JOIN t3_myisam; COUNT(*) 1 DROP TABLE t3_myisam; ************************************************************ * Deleting table with char+binary types ************************************************************ DROP TABLE t3;