add more explains and examples for `SELECT ... INTO OUTFILE` statements (#15104)#15507

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ti-chi-bot[bot] merged 15 commits intopingcap:release-7.4from ti-chi-bot:cherry-pick-15104-to-release-7.4

Nov 28, 2023

+77-5

Commits on Nov 28, 2023

fixup

qw4990
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fixup

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Update sql-statements/sql-statement-select.md

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Update sql-statements/sql-statement-select.md

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Update sql-statements/sql-statement-select.md

qw4990
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Update sql-statements/sql-statement-select.md

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Update sql-statements/sql-statement-select.md

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Update sql-statements/sql-statement-select.md

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Update sql-statements/sql-statement-select.md

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Update sql-statements/sql-statement-select.md

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Apply suggestions from code review

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Apply suggestions from code review

qiancai
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refine the descriptions

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Update sql-statements/sql-statement-select.md

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Update sql-statements/sql-statement-select.md

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