Select * from a letf join on a. d. ata> b=b.s tratdata and a. d. ata <=b.e nddata-CodePudding

Home > database > Select * from a letf join on a. d. ata> b=b.s tratdata and a. d. ata <=b.e nddata

Select * from a letf join on a. d. ata> b=b.s tratdata and a. d. ata <=b.e nddata

Time：10-20

Can't afford to left, it is concluded that only common data part only, why?

CodePudding user response:

You are * select and from the middle

CodePudding user response:

letf join
Left the join leftist writers, on the basis of the left a link b
What is the database? The simulated data