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double quotes: what to replace--11, Stuff: Character substitution functionSelect STUFF (' Hunan Wuhan ', 2, 1, ' North ')Select STUFF (' Changsha, China ', 3, 0, ' Wuhan ')--12, LTrim, and RTrim: Remove all whitespace from the left or right of the stringSelect Len (LTRIM (' abc d ')), LEN (RTRIM (' abc d '))--13, STR: Converting a value to a string functionSelect STR (12345.7654,5,2)--8-bit 2-bit decimal place--14, Char: Converts an ASCII value to one characterSelect CHAR, ASCII (' * ') --Date

); Console.log ("Index_4:nbsP; ", index_4); //output: index_4:0 the above section1An example outputs the result of-1, why? In fact, the problem is to determine whether two objects are equal. in the JSin development, when judging whether two objects are equal, only two objects point to the same address, and the two objects are equal, and sometimes two objects may have equal properties and values, but the two objects are still unequal. The same is true for two arrays (also objects) that are judged

0.0 0 0pts/2z+ -: - 0:xx[A. out] Root16982 0.0 0.0 0 0pts/2z+ -: - 0:xx[A. out] Root16983 0.0 0.0 0 0pts/2z+ -: - 0:xx[A. out] Root16985 0.0 0.0 0 0pts/2z+ -: - 0:xx[A. out] Root16987 0.0 0.0 4340 804pts/3S+ -: - 0:xxgrep-w z[[email protected] desktop]# when putting signal (SIGCHLD, sig_ign); This line of code adds the following output:[[email protected] desktop]# gcc B.c[[email protected] desktop]#./A. outI son/PA ppid pid fpid0Child17

GetDate () --------Select getUTCDate () 11. Mathematical Functions -------Select Pi () -------Select Rand, RAND (), RAND (), Rand () -------Select round (rand (), 3), round (rand (100), 5) -------Select Round (123.456, 2), round (254.124,-2) -------Select Round (123.4567, 1, 2) 12. String ------Select Len (String) ------Select Reverse (String) ------Select Left (String, 4) ------Select Right (string, 4) ------Select LOWER (' abc '), Lower (' abc ') ------Select UPPER (' abc '), Upper (' abc ')

Tags:escupdate modify delete sort lteselect query statement key Conditional modification:Update table name set column name = value where column name = valueConditional Delete:Delete from table name where column name = valueAdvanced QueryConditional queryCheck column * Instead of columns to view, comma separated by multiple columnsFilter criteria where column name = >= Fuzzy querySELECT * FROM table name where column name like '% value% '% wildcardSort queriesSELECT * FROM table name where order