MySQL Conclusion
2013-10-31 11:08
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1、Select total count from a table:
select count(1) from 'tablename' where 1=1 ;
2、No where condition delete whole table data method:
SET SQL_SAFE_UPDATES=0 ;
3、How to connect String?
in MySQL: use concat(string1,string2);[/code]
4、How to Unique constraint on multiple fields?
5、How to import sql-script to EER-diagram in mysql workbench?
in EER-Diagram perspective, select FILE-->import-->Reverse Engineer MySQL Create Script, OK!
select count(1) from 'tablename' where 1=1 ;
2、No where condition delete whole table data method:
SET SQL_SAFE_UPDATES=0 ;
3、How to connect String?
in MySQL: use concat(string1,string2);[/code]
4、How to Unique constraint on multiple fields?
alter table Variable_Entries add unique (var_id, value);
5、How to import sql-script to EER-diagram in mysql workbench?
in EER-Diagram perspective, select FILE-->import-->Reverse Engineer MySQL Create Script, OK!
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