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SET @session_start_value = @@session.timestamp; '#--------------------FN_DYNVARS_001_01------------------------#' SET @@timestamp = DEFAULT; SELECT FLOOR(@@timestamp) = UNIX_TIMESTAMP(); FLOOR(@@timestamp) = UNIX_TIMESTAMP() 1 '#---------------------FN_DYNVARS_001_02-------------------------#' SET @@global.timestamp = "1000"; ERROR HY000: Variable 'timestamp' is a SESSION variable and can't be used with SET GLOBAL '#--------------------FN_DYNVARS_001_03------------------------#' SET @@timestamp = 0; SELECT FLOOR(@@timestamp) = UNIX_TIMESTAMP(); FLOOR(@@timestamp) = UNIX_TIMESTAMP() 1 'Setting 0 resets timestamp to session default timestamp' SET @@timestamp = -1000000000; Warnings: Warning 1292 Truncated incorrect timestamp value: '-1000000000' SELECT FLOOR(@@timestamp) = UNIX_TIMESTAMP(); FLOOR(@@timestamp) = UNIX_TIMESTAMP() 1 SET @temp_ts = @@timestamp - @@timestamp; SELECT @temp_ts; @temp_ts 0 '#--------------------FN_DYNVARS_001_04-------------------------#' SET @@timestamp = "100"; ERROR 42000: Incorrect argument type to variable 'timestamp' SET @@timestamp = " "; ERROR 42000: Incorrect argument type to variable 'timestamp' SET @@timestamp = 9999999999999999999999; ERROR 42000: Variable 'timestamp' can't be set to the value of '1e22' '#----------------------FN_DYNVARS_001_06------------------------#' '#---------------------FN_DYNVARS_001_08-------------------------#' SET @@timestamp = OFF; ERROR 42000: Incorrect argument type to variable 'timestamp' SET @@timestamp = ON; ERROR 42000: Incorrect argument type to variable 'timestamp' SET @@timestamp = TRUE; SELECT @@timestamp; @@timestamp 1.000000 SET @@timestamp = FALSE; '#---------------------FN_DYNVARS_001_10----------------------#' SET @@timestamp = 123456; SELECT @@timestamp = @@local.timestamp and @@timestamp = @@session.timestamp; @@timestamp = @@local.timestamp and @@timestamp = @@session.timestamp 1 SET @@timestamp = 654321; SELECT @@timestamp = @@local.timestamp and @@timestamp = @@session.timestamp; @@timestamp = @@local.timestamp and @@timestamp = @@session.timestamp 1 '#---------------------FN_DYNVARS_001_11----------------------#' SET timestamp = 1; SELECT @@timestamp; @@timestamp 1.000000 SELECT local.timestamp; ERROR 42S02: Unknown table 'local' in field list SELECT session.timestamp; ERROR 42S02: Unknown table 'session' in field list SELECT timestamp = @@session.timestamp; ERROR 42S22: Unknown column 'timestamp' in 'field list' SET @@timestamp = @session_start_value;