PS: essays written to use in SQL Server (duplicate, replace, intercept, to space, to the number of digits after the decimal point)
/*---------------------------repeat-------------------- ------------ * /
- {return repeated string abc # abc # abc #]
SELECT replicate ( 'ABC #',. 3);
/ * --------- ------------------replace------------------------------- - * /
- e replacement string will be replaced by E [return] abcEdEf
--replace ( 'string', 'text before replacement', 'text after replacement')
SELECT replace ( 'abcedef', 'e' , 'E');
- the replacement string specified location heABCworld [Back]
--stuff ( 'string', where replacement starts, alternatively several, 'character to replace')
SELECT Stuff ( 'Hello World', . 3,. 4, 'the ABC');
/ * ---------------------------- taken ---------- ---------------------- * /
- intercepting the returned string [a, ab, Wrold]
--subString ( 'string', taken where to start , taken several)
SELECT subString ( 'ABC',. 1,. 1), subString ( 'ABC',. 1, 2),
subString ( 'Hello Wrold',. 7,. 5);
- Take the left return string [left, leftStr]
--left ( 'string', taken from the left several)
left SELECT ( 'LeftString',. 4);
SELECT left ( 'LeftString',. 7);
- the right to take the returned string [String, ing]
--right ( 'string', starts from the right to take a few)
SELECT right ( 'LeftString',. 6);
SELECT right ( 'LeftString',. 3);
/ * --------------------------- go blank - --------------------------------- * /
- to remove the spaces left
select ltrim ( 'abc'), ltrim ( 'ABC # #'), LTRIM ( 'ABC');
- the right to remove the spaces
SELECT RTRIM ( 'ABC'), RTRIM ( 'ABC # #'), RTRIM ( 'ABC');
/ * ----- -------------------- ------------------------ go after the decimal point ---- * /
- with the function ROUND (numeric, s), where s denotes the number of decimal places
SELECT ROUND (4.994,2) - returns 4.990
- a function CAST (values as numeric (n, s)) , wherein n represents the number of significant digits, s represents decimal
SELECT CAST (4.994 as numeric (10,2 )) - 4 search returns.99
- a function CONVERT (numeric (n, s) , value), where n represents the number of significant digits, s represents the number of decimal places
SELECT CONVERT (numeric (10,2), 4.9852222) - Returns 4.99