SQL - String Handling Functions - Demo using Oracle

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Just a quick look at some of the String handling functions
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I am a new sql learner, and feeling joyous to learn from this channel.
I have only simple enquiry.
I came across the varchar() function... What is the best practice when deciding to chose a number for that function given i am going to extract names for example...Can i put 1000 for instance so that i can be in the safe side or that may rise problems.
Thanks a lot.

hasanmougharbel