作业帮drop table if exists address_book;这句SQL语句是什么意思我备份的SQL语句中有这么一行,
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drop table if exists address_book;这句SQL语句是什么意思我备份的SQL语句中有这么一行,
drop table if exists address_book;这句SQL语句是什么意思
我备份的SQL语句中有这么一行,
drop table if exists address_book;这句SQL语句是什么意思我备份的SQL语句中有这么一行,
如果数据库中存在address_book表,就把它从数据库中drop掉.
备份sql中一般都有这样的语句,如果是数据库中有这个表,先drop掉,然后create表,然后再进行数据插入.
drop table if exists address_book;这句SQL语句是什么意思我备份的SQL语句中有这么一行,
数据库中if OBJECT_ID ('dbo.table_test_6_1','u') is not null drop table table_test_6_1判断是否存在该
exists
// IF EXISTS (SELECT name FROM m
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If you were a tear drop
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Drop
drop
drop
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if we have time,we will____for dinner A.drop B.drop in C.have D./