bit.sql

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

--
-- BIT types
--

--
-- Build tables for testing
--

CREATE TABLE BIT_TABLE(b BIT(11));

INSERT INTO BIT_TABLE VALUES (B'10'); -- too short
INSERT INTO BIT_TABLE VALUES (B'00000000000');
INSERT INTO BIT_TABLE VALUES (B'11011000000');
INSERT INTO BIT_TABLE VALUES (B'01010101010');
INSERT INTO BIT_TABLE VALUES (B'101011111010'); -- too long
--INSERT INTO BIT_TABLE VALUES ('X554');
--INSERT INTO BIT_TABLE VALUES ('X555');

SELECT * FROM BIT_TABLE; 

CREATE TABLE VARBIT_TABLE(v BIT VARYING(11));

INSERT INTO VARBIT_TABLE VALUES (B'');
INSERT INTO VARBIT_TABLE VALUES (B'0');
INSERT INTO VARBIT_TABLE VALUES (B'010101');
INSERT INTO VARBIT_TABLE VALUES (B'01010101010');
INSERT INTO VARBIT_TABLE VALUES (B'101011111010'); -- too long
--INSERT INTO VARBIT_TABLE VALUES ('X554');
--INSERT INTO VARBIT_TABLE VALUES ('X555');
SELECT * FROM VARBIT_TABLE; 


-- Concatenation
SELECT v, b, (v || b) AS concat
       FROM BIT_TABLE, VARBIT_TABLE 
       ORDER BY 3;

-- Length
SELECT b, length(b) AS lb
       FROM BIT_TABLE;
SELECT v, length(v) AS lv
       FROM VARBIT_TABLE;

-- Substring
SELECT b,
       SUBSTRING(b FROM 2 FOR 4) AS sub_2_4,
       SUBSTRING(b FROM 7 FOR 13) AS sub_7_13,
       SUBSTRING(b FROM 6) AS sub_6
       FROM BIT_TABLE;
SELECT v,
       SUBSTRING(v FROM 2 FOR 4) AS sub_2_4,
       SUBSTRING(v FROM 7 FOR 13) AS sub_7_13,
       SUBSTRING(v FROM 6) AS sub_6
       FROM VARBIT_TABLE;

--- Bit operations
DROP TABLE varbit_table;
CREATE TABLE varbit_table (a BIT VARYING(16), b BIT VARYING(16));
COPY varbit_table FROM stdin;
X0F	X10
X1F	X11
X2F	X12
X3F	X13
X8F	X04
X000F	X0010
X0123	XFFFF
X2468	X2468
XFA50	X05AF
X1234	XFFF5
\.

SELECT a, b, ~a AS "~ a", a & b AS "a & b", 
       a | b AS "a | b", a # b AS "a # b" FROM varbit_table;
SELECT a,b,a<b AS "a<b",a<=b AS "a<=b",a=b AS "a=b",
        a>=b AS "a>=b",a>b AS "a>b",a<>b AS "a<>b" FROM varbit_table;
SELECT a,a<<4 AS "a<<4",b,b>>2 AS "b>>2" FROM varbit_table;

DROP TABLE varbit_table;

--- Bit operations
DROP TABLE bit_table;
CREATE TABLE bit_table (a BIT(16), b BIT(16));
COPY bit_table FROM stdin;
X0F00	X1000
X1F00	X1100
X2F00	X1200
X3F00	X1300
X8F00	X0400
X000F	X0010
X0123	XFFFF
X2468	X2468
XFA50	X05AF
X1234	XFFF5
\.

SELECT a,b,~a AS "~ a",a & b AS "a & b", 
	a|b AS "a | b", a # b AS "a # b" FROM bit_table;
SELECT a,b,a<b AS "a<b",a<=b AS "a<=b",a=b AS "a=b",
        a>=b AS "a>=b",a>b AS "a>b",a<>b AS "a<>b" FROM bit_table;
SELECT a,a<<4 AS "a<<4",b,b>>2 AS "b>>2" FROM bit_table;

DROP TABLE bit_table;


-- The following should fail
select B'001' & B'10';
select B'0111' | B'011';
select B'0010' # B'011101';

-- More position tests, checking all the boundary cases
SELECT POSITION(B'1010' IN B'0000101');   -- 0
SELECT POSITION(B'1010' IN B'00001010');  -- 5
SELECT POSITION(B'1010' IN B'00000101');  -- 0
SELECT POSITION(B'1010' IN B'000001010');  -- 6

SELECT POSITION(B'' IN B'00001010');  -- 1
SELECT POSITION(B'0' IN B'');  -- 0
SELECT POSITION(B'' IN B'');  -- 0
SELECT POSITION(B'101101' IN B'001011011011011000');  -- 3
SELECT POSITION(B'10110110' IN B'001011011011010');  -- 3
SELECT POSITION(B'1011011011011' IN B'001011011011011');  -- 3
SELECT POSITION(B'1011011011011' IN B'00001011011011011');  -- 5

SELECT POSITION(B'11101011' IN B'11101011'); -- 1
SELECT POSITION(B'11101011' IN B'011101011'); -- 2
SELECT POSITION(B'11101011' IN B'00011101011'); -- 4
SELECT POSITION(B'11101011' IN B'0000011101011'); -- 6

SELECT POSITION(B'111010110' IN B'111010110'); -- 1
SELECT POSITION(B'111010110' IN B'0111010110'); -- 2
SELECT POSITION(B'111010110' IN B'000111010110'); -- 4
SELECT POSITION(B'111010110' IN B'00000111010110'); -- 6

SELECT POSITION(B'111010110' IN B'11101011'); -- 0
SELECT POSITION(B'111010110' IN B'011101011'); -- 0
SELECT POSITION(B'111010110' IN B'00011101011'); -- 0
SELECT POSITION(B'111010110' IN B'0000011101011'); -- 0

SELECT POSITION(B'111010110' IN B'111010110'); -- 1
SELECT POSITION(B'111010110' IN B'0111010110'); -- 2
SELECT POSITION(B'111010110' IN B'000111010110'); -- 4
SELECT POSITION(B'111010110' IN B'00000111010110'); -- 6

SELECT POSITION(B'111010110' IN B'000001110101111101011'); -- 0
SELECT POSITION(B'111010110' IN B'0000001110101111101011'); -- 0
SELECT POSITION(B'111010110' IN B'000000001110101111101011'); -- 0
SELECT POSITION(B'111010110' IN B'00000000001110101111101011'); -- 0

SELECT POSITION(B'111010110' IN B'0000011101011111010110'); -- 14
SELECT POSITION(B'111010110' IN B'00000011101011111010110'); -- 15
SELECT POSITION(B'111010110' IN B'0000000011101011111010110'); -- 17
SELECT POSITION(B'111010110' IN B'000000000011101011111010110'); -- 19

SELECT POSITION(B'000000000011101011111010110' IN B'000000000011101011111010110'); -- 1
SELECT POSITION(B'00000000011101011111010110' IN B'000000000011101011111010110'); -- 2
SELECT POSITION(B'0000000000011101011111010110' IN B'000000000011101011111010110'); -- 0


-- Shifting

CREATE TABLE BIT_SHIFT_TABLE(b BIT(16));
INSERT INTO BIT_SHIFT_TABLE VALUES (B'1101100000000000');
INSERT INTO BIT_SHIFT_TABLE SELECT b>>1 FROM BIT_SHIFT_TABLE;
INSERT INTO BIT_SHIFT_TABLE SELECT b>>2 FROM BIT_SHIFT_TABLE;
INSERT INTO BIT_SHIFT_TABLE SELECT b>>4 FROM BIT_SHIFT_TABLE;
INSERT INTO BIT_SHIFT_TABLE SELECT b>>8 FROM BIT_SHIFT_TABLE;
SELECT POSITION(B'1101' IN b),
       POSITION(B'11011' IN b),
       b 
       FROM BIT_SHIFT_TABLE ;


CREATE TABLE VARBIT_SHIFT_TABLE(v BIT VARYING(20));
INSERT INTO VARBIT_SHIFT_TABLE VALUES (B'11011');
INSERT INTO VARBIT_SHIFT_TABLE SELECT CAST(v || B'0' AS BIT VARYING(6)) >>1 FROM VARBIT_SHIFT_TABLE;
INSERT INTO VARBIT_SHIFT_TABLE SELECT CAST(v || B'00' AS BIT VARYING(8)) >>2 FROM VARBIT_SHIFT_TABLE;
INSERT INTO VARBIT_SHIFT_TABLE SELECT CAST(v || B'0000' AS BIT VARYING(12)) >>4 FROM VARBIT_SHIFT_TABLE;
INSERT INTO VARBIT_SHIFT_TABLE SELECT CAST(v || B'00000000' AS BIT VARYING(20)) >>8 FROM VARBIT_SHIFT_TABLE;
SELECT POSITION(B'1101' IN v),
       POSITION(B'11011' IN v),
       v 
       FROM VARBIT_SHIFT_TABLE ;


DROP TABLE BIT_SHIFT_TABLE;
DROP TABLE VARBIT_SHIFT_TABLE;