SAPHANA学习（20）：SQL Function(T)

/*

141.TAN

TAN(<number>)

返回正切值

TANH(<number>)

返回指定数值参数的双曲正切值。

*/

SELECT TAN (0.0) FROM DUMMY;
SELECT TANH(1) FROM DUMMY;

/*

142. 类型转换

TO_ALPHANUM(<value>)

转换为alphanum类型

TO_BIGINT(<value>)

转换为bigint类型

TO_BINARY(<value>)

转换为binary类型

TO_BLOB(<value>)

 <value> ::= <binary string> | <nclob_value> | <clob_value>

转换为BLOB数据类型

TO_BOOLEAN(<value>)

转换为boolean类型

1，‘true’,true返回1;

0,'false',false返回0;

unknown,'unknown'返回值；

大小写不敏感；

TO_CLOB(<value>)

转换为CLOB类型

TO_DATE(<date> [, <format>])

转换为DATE类型

TO_DATS(<date>)

Converts a date string into an ABAP DATE string.

TO_DECIMAL(<value> [, <precision>, <scale>])

转换WieDECIMAL类型

<precision>数位，1~38，默认34

<scale>小数位数

TO_DOUBLE(<value>)

转换为DOUBLE类型

TO_FIXEDCHAR(<string>, <size>)

转换<size>长度字符

TO_INT(<value>)

转换为INT类型

TO_INTEGER(<value>)

转换为INTEGER类型

TO_JSON_BOOLEAN(<value>)

Converts a given <value> to a boolean value in JSON format.

TO_NCLOB(<value>)

转换为NCLOB类型

TO_NVARCHAR(<value> [, <format>])

转换为NVARCHAR类型

TO_VARCHAR(<value> [, <format>])

转换为VARCHAR类型

--转换符号

--9 - Return the number in the specified position; otherwise, return nothing.

--0 - Return the number in the specified position; otherwise, return a zero (0).

--S - Return the sign symbol (either + or -) for the value.

--E - Divide the number into significant part and exponent part.

--% - Multiply <value> by 10^2 and adds a percent symbol (%) at the end.

--. (a period) - Insert a period in the specified position.

--All other characters other than the items above: Return the character in the specified position.

TO_REAL(<value>)

转换为REAL类型

TO_SECONDDATE(<date> [, <format>])

转换为SECONDDATE数据类型

TO_SMALLDECIMAL(<value>)

转换为SMALLDECIMAL类型

TO_SMALLINT(<value>)

转换为SMALLINT类型

TO_TIME(<time> [, <format>])

转换为TIME类型

TO_TIMESTAMP(<date> [, <format>])

转换为TIMESTAMP类型

TO_TINYINT(<value>)

转换为TINYINT类型

*/

SELECT TO_ALPHANUM ('10') FROM DUMMY;
SELECT TO_BIGINT ('10') FROM DUMMY;
SELECT TO_BIGINT (10.1) FROM DUMMY;
SELECT TO_BINARY ('abc') FROM DUMMY;

SELECT TO_BLOB(TO_BINARY('abcde')) "to blob" FROM DUMMY;
SELECT TO_BLOB(TO_CLOB('abc')) "to blob" FROM DUMMY;

SELECT TO_BOOLEAN(0) FROM DUMMY;
SELECT TO_BOOLEAN('true') FROM DUMMY;
SELECT TO_BOOLEAN('False') FROM DUMMY;

SELECT TO_CLOB ('TO_CLOB converts the value to a CLOB data type') FROM DUMMY;
SELECT TO_DATE('2010/01/12', 'YYYY/MM/DD') FROM DUMMY;
--YYYYMMDD类型
SELECT TO_DATS ('2010-01-12') "abap date" FROM DUMMY;
SELECT TO_DECIMAL(7654321.888888, 10, 3) FROM DUMMY;
SELECT TO_DOUBLE ('15.12') FROM DUMMY;
--返回An
SELECT TO_FIXEDCHAR ('Ant', 2) FROM DUMMY;

SELECT TO_INT (123.3) FROM DUMMY;
SELECT TO_INTEGER ('11') FROM DUMMY;

--创建COLLECTION,
--CREATE COLLECTION TEST_COLLECTION;
--INSERT INTO TEST_COLLECTION VALUES ('{"k1" : true}');
--SELECT * FROM TEST_COLLECTION WHERE "k1" = TO_JSON_BOOLEAN(TRUE);

SELECT TO_NCLOB ('TO_NCLOB converts the value to a NCLOB data type') FROM DUMMY;

--转换日期格式
SELECT TO_NVARCHAR(TO_DATE('2009/12/31'), 'YY-MM-DD') FROM DUMMY;
SELECT TO_NVARCHAR(1, '00.00') FROM Dummy;    --> 01.00
SELECT TO_NVARCHAR(100, '00.00') FROM Dummy;          --> 100.00
SELECT TO_NVARCHAR(100, '9999.00') FROM Dummy;        --> 100.00
SELECT TO_NVARCHAR(100, '0000.00') FROM Dummy;        --> 0100.00
SELECT TO_NVARCHAR(100, 'S0000.00') FROM Dummy;       --> +0100.00
SELECT TO_NVARCHAR(-100, 'S0000.00') FROM Dummy;      --> -0100.00
SELECT TO_NVARCHAR(-100, 'S0.0E0') FROM Dummy;        --> -1.0E2
SELECT TO_NVARCHAR(-0.001, 'S0.0E0') FROM Dummy;      --> -1.0E-3
SELECT TO_NVARCHAR(-0.001, 'S0.0E00') FROM Dummy;     --> -1.0E-03
SELECT TO_NVARCHAR(1000, '9,999.00') FROM Dummy;      --> 1,000.00
SELECT TO_NVARCHAR(1000, '$9,999.00') FROM Dummy;     --> $1,000.00
SELECT TO_NVARCHAR(1000, '$9,999.99') FROM Dummy;     --> $1,000.

SELECT 3*TO_REAL ('15.12')  FROM DUMMY;
SELECT TO_SECONDDATE ('2010-01-11 13:30:00', 'YYYY-MM-DD HH24:MI:SS') FROM DUMMY;
SELECT TO_SMALLDECIMAL(7654321.89) FROM DUMMY;
SELECT TO_SMALLINT(10.5) FROM DUMMY;

SELECT TO_TIME('08:30 AM', 'HH:MI AM') FROM DUMMY;
SELECT TO_TIMESTAMP ('2010-01-11 13:30:00', 'YYYY-MM-DD HH24:MI:SS') FROM DUMMY;

SELECT TO_TINYINT ('10') FROM DUMMY;

/*

143.TRIM

TRIM([[LEADING | TRAILING | BOTH] <trim_char> FROM] <string> )

去除前置or后置字符

默认BOTH

TRIM_ARRAY(<array_value_expression>, <truncate_length>)

去除Array中指定数目元素

*/

--去除前置，后置字符
SELECT TRIM ('a' FROM 'aaa123456789aa') FROM DUMMY;

--去除前置字符
SELECT TRIM (LEADING 'a' FROM 'aaa123456789aa') FROM DUMMY;

--移除3个元素
SELECT TRIM_ARRAY(VAL, 3) FROM ARRAY_TEST;