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CREATE TABLE example(
ID Number(4) NOT NULL PRIMARY KEY,
NAME VARCHAR(25),
PHONE VARCHAR(10),
ADDRESS VARCHAR(50)
);
È»ºó£¬ÄãÐèÒªÒ»¸ö×Ô¶¨ÒåµÄsequence
CREATE SEQUENCE emp_sequence
INCREMENT BY 1 -- ÿ´Î¼Ó¼¸¸ö
START WITH 1 -- ´Ó1¿ªÊ¼¼ÆÊý
NOMAXVALUE -- ²»ÉèÖÃ×î´óÖµ
NOCYCLE -- Ò»Ö±ÀÛ¼Ó£¬²»Ñ»·
NOCACHE -- ²»½¨»º³åÇø
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,ÕâÑùÔÚ·´¸´²Ù×÷ʱ»á¼Ó¿ìÔËÐÐËÙ¶È,µ«Èç¹ûÔâÓöÒâÍâÇé¿öÈçµ±»úÁË»òoracleËÀÁË,ÔòÏ´ÎÈ¡³öµÄseqÖµ½«ºÍÉϴεIJ»Á¬¹á.(Èç¹ûÁ¬²»Á¬¹áÎÞËùν½¨ÒéÓÃcache,ÒòΪʱ¼ä¾ÍÊǽðǮѽ!ÅÜÌâÁË£¡)
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CREATE TRIGGER "´¥·¢Æ÷Ãû³Æ" BEFORE
INSERT ON example FOR EACH ROW WHEN (new.id is null)
begin
&nbs
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SELECT trim(NAME) ||' '|| VALUE from v$parameter
WHERE NAME IN ('sga_max_size','db_cache_size','shared_pool_size',
'shared_pool_reserved_size','large_pool_size','java_pool_size',
'db_block_size','db_block_buffers','log_buffer','sort_area_si ......
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The following are number examples for the to_char
function.
to_char
(1210.73,
'9999.9')
would return '1210.7'
to_char
(1210.73,
'9,999.99')
would return '1,210.73'
to_char
(1210.73,
'$9,999.00')
would return
'$1,210.73'
to_char
(21,
'000099')
would return '000021'
The foll ......